List of useful links for musicologists, and musicians in general, focusing mainly on early music and Czech resources.
under construction, substantially more updated on the Czech version
Digital Resources for Musicology - https://drm.ccarh.org/
Golden Pages for Musicologists - https://goldenpages.miraheze.org/wiki/Main_Page
Online Resources for Music Scholars - https://guides.library.harvard.edu/onmusic
List of online digital musical document libraries - https://en.wikipedia.org/wiki/List_of_online_digital_musical_document_libraries
Music in MusicXML Format - https://www.musicxml.com/music-in-musicxml/
Encyklopedias, dictionaries
Grove Music Online - https://www.oxfordmusiconline.com/grovemusic/
Die Musik in Geschichte und Gegenwart - https://www.mgg-online.com/
Český hudební slovník - https://www.ceskyhudebnislovnik.cz/
Literature
The Union Catalogue of the Czech Republic - https://aleph.nkp.cz/F/?func=file&file_name=find-b&local_base=skc&CON_LNG=ENG
Musica Subject Gateway - https://mus.knihovny.cz/?lng=en
WorldCat - https://www.worldcat.org/
Discovery Service UKAŽ (Charles University) - https://ukaz.cuni.cz/en
Sheet music
Electronic and Virtual Editions - https://eve.ccarh.org/
International Music Score Library Project - https://imslp.org/
Choral Public Domain Library - https://www.cpdl.org/
GregoBase - https://gregobase.selapa.net/
Web Library of Seventeenth-Century Music - https://www.sscm-wlscm.org/
Musikedition Tirol - https://musikedition.musikland-tirol.at/
Gesualdo Online - https://ricercar.gesualdo-online.cesr.univ-tours.fr/
Measuring Polyphony - https://measuringpolyphony.org/
Marenzio Online Digital Edition - http://www.marenzio.org/
New Senfl Edition - https://senflonline-eng.com/
Monte-Online-Project - http://monte-online.org/
Primary sources
RISM Resources - https://opac.rism.info/index.php?id=9
Europeana - https://www.europeana.eu/
Internet Archive - https://archive.org/
Google Books - https://books.google.com/
Google Scholar - https://scholar.google.com/
databases
RISM Online - https://rism.online/
RISM Library Sigla - https://rism.info/community/sigla.html
DIAMM - https://www.diamm.ac.uk/
Cantus Index - http://cantusindex.org/
Gregorien - https://gregorien.info/en
Medieval Music Manuscripts Online Database - http://musmed.eu/
The Mass Database - http://www.mdb.uni-mainz.de/
The Polyphony Database - https://www.polyphonydatabase.com/
Motet Cycles Database - http://motetcycles.ch/
Printed Sacred Music Database - http://www.printed-sacred-music.org/
A Catalogue of Motets, Mass, Office, and Holy Week Music Printed in Italy, 1516–1770 - https://sscm-jscm.org/instrumenta/instrumenta-volumes/instrumenta-volume-2/
by country
https://en.wikipedia.org/wiki/Category:Digital_libraries_by_country
Czechia
Digital Library of the National Library (Prague) - https://ndk.cz/
Digital Library of the Moravian Library (Brno) - https://www.digitalniknihovna.cz/mzk
Manuscriptorium - https://www.manuscriptorium.com/cs
Prague City Archives - http://dokumenty.ahmp.cz/dokumenty/
Czech Museum of Music - https://cmh.opac.nm.cz/
Melodiarium hymnologicum Bohemiae - https://melodiarium.musicologica.cz/
LIMVP - http://www.clavmon.cz/limup/
Slovakia
Digital library of the Slovak National Library - https://dikda.snk.sk/
Univerzitná knižnica v Bratislave - http://digitalna.kniznica.info/
Slovak Early Music Database - http://cantus.sk/
Germany
Deutsche Digitale Bibliothek - https://www.deutsche-digitale-bibliothek.de/
Austria
Österreichische Nationalbibliothek - https://onb.digital/
Mittelalterliche Handschriften in Österreich - https://manuscripta.at/
Landesbibliotheken Österreichs - https://landesbibliotheken.at/
VerbundServer der Theologischen und Kirchlichen Institutionen - https://vthk.eu/
Poland
Federacja Bibliotek Cyfrowych - https://fbc.pionier.net.pl/
Polona (Biblioteka Narodowa) - https://polona.pl/
Jagiellońska Biblioteka Cyfrowa - https://jbc.bj.uj.edu.pl/
Cyfrowa Biblioteka Diecezjalna w Sandomierzu - https://bc.bdsandomierz.pl/
Śląska Biblioteka Cyfrowa - https://www.sbc.org.pl/
Hungary
Digital Archives Portal - https://www.eleveltar.hu/
Italy
Servizio Bibliotecario Nazionale - https://opac.sbn.it/
Museo internazionale e biblioteca della musica di Bologna - http://www.bibliotecamusica.it/
The Sound of St Mark's (Venetian Music Online) - http://vmo.unive.it/choirbooks/
Vatican City
Biblioteca Apostolica Vaticana - https://digi.vatlib.it/mss
Spain
Biblioteca Digital Hispánica - http://bdh.bne.es/
Spanish Early Music Manuscripts Database - http://musicahispanica.eu/
Inventari dels Fons Musicals de Catalunya - https://ifmuc.uab.cat/
Libros de polifonía hispana - https://hispanicpolyphony.eu/home
Memòria Digital de Catalunya - http://mdc1.csuc.cat
Fons Musical de la Catedral de Barcelona - https://mdc.csuc.cat/digital/collection/musicatedra
La Biblioteca Virtual del Patrimonio Bibliográfico - https://bvpb.mcu.es/musica/es/micrositios/inicio.do
Real Biblioteca del Monasterio de San Lorenzo de El Escorial - https://rbmecat.patrimonionacional.es/
Portugal
Biblioteca Nacional Digital - https://bndigital.bnportugal.gov.pt/
The Portuguese Early Music Database - http://pemdatabase.eu/
France
Gallica - https://gallica.bnf.fr/
Great Britain
British Library - https://explore.bl.uk/
Switzerland
e-codices - http://www.e-codices.unifr.ch/
Sweden
The Düben Collection Database Catalogue - https://www2.musik.uu.se/duben/Duben.php
Belgium
Koninklijke Bibliotheek van België - https://belgica.kbr.be/
United States of America
Library of Congress - https://www.loc.gov/notated-music/
Biblioteca Digital del Patrimonio Iberoamericano - http://www.iberoamericadigital.net/
Muzikological and musical institutions
Czechia
Department of Musicology, Czech Academy of Sciences - https://www.udu.cas.cz/cz/oddeleni/muzikologie
Slovakia
Institute of Musicology, Slovak Academy of Sciences - http://uhv.sav.sk/en/
educational
Institute of Musicology, Faculty of Arts, Charles University (Prague) - https://uhv.ff.cuni.cz/en/
Department of Musicology, Faculty of Arts, Palacky University (Olomouc) - https://muzikologie.upol.cz/en/
Department of Musicology, Faculty of Arts, Masaryk University (Brno) - https://www.phil.muni.cz/en/about-us/organisational-structure/213400-deptof-musicology
museums, libraries, and archives
Czech Museum of Music - https://www.nm.cz/en/visit-us/buildings/czech-museum-of-music
Music department, National Library of the Czech Republic - https://www.en.nkp.cz/about-us/professional-activities/music
Music department, Municipal Library of Prague - https://www.mlp.cz/en/
Sheet music archive, Czech Radio - https://www.czech.radio/czech-radio-hire-library-8033757
Antonín Dvořák Memorial - https://antonindvorak.cz/en/
Antonín Dvořák Museum - https://www.nm.cz/en/visit-us/buildings/antonin-dvorak-museum
Bedřich Smetana Museum - https://www.nm.cz/en/visit-us/buildings/bedrich-smetana-museum
Leoš Janáček Memorial - https://www.leosjanacek.eu/en/
Jaroslav Ježek Memorial (The Blue Room) - https://www.nm.cz/en/visit-us/buildings/jaroslav-jezek-memorial-the-blue-room
Popmuzeum - Museum and Archive of Popular Music - https://www.popmuseum.cz/
under construction
societies, institutes, foundations
Czechia
Czech musicological society - https://www.cshv.cz/index.php/about-cshv
Society for Early Music - http://ssh.early-music.cz/
Society of Spiritual Music - http://sdh.cz/?a=&j=2
Czech Music Fund - https://www.nchf.cz/
Česká společnost pro hudební fyziologii a medicínu hudebníků - https://www.medicinahudebniku.cz/
Society for Electroacoustic Music - http://www.seah.cz/
Společnost pro hudební výchovu ČR - https://www.shvcr.cz/
Hudební informační středisko - https://www.musica.cz/en/
Institut Bohuslava Martinů - https://www.martinu.cz/en/
Karpálová Society - http://www.kapralova.org/
Mozart Society in Czech Republic - https://www.mozartovaobec.cz/?stranka=109
The Czech Handel Society - http://www.haendel.cz/estart.php
Association for Central European Cultural Studies - https://www.acecs.cz/
world
International Musicological Society - https://www.musicology.org/
International Association of Music Libraries, Archives and Documentation Centres - https://www.iaml.info/
European Music Council - https://www.emc-imc.org/
Society for Music Theory - https://societymusictheory.org/
Society for Ethnomusicology - https://www.ethnomusicology.org/
International Council for Traditions of Music and Dance - http://www.ictmusic.org/
European Early Music Network - http://rema-eemn.net/
International Association of Sound and Audiovisual Archives - https://www.iasa-web.org/
International Association of Music Centres - http://www.iamic.net/
European Seminar in Ethnomusicology - http://esem-music.eu/
Welcome to The International Society for Orthodox Church Music - http://www.isocm.com/
Musicological journals in Czechia
under construction
Summer schools of early music in Czechia
Inernational Summer School of Early Music (Valtice) - https://www.early-music.cz/en/
Summer School of Baroque Music (Holešov) - https://www.baroknihudba.cz/en/
under construction
Festivals of early music in Czechia
under construction
Digital humanities
Czechia
Digital Humanities, AV ČR - https://digitalhumanities.cz/en/
Czech Association for Digital Humanities - https://www.czadh.cz/en/
world
Archive of Digital Applications in Musicology - https://wiki.ccarh.org/wiki/Archive_of_Digital_Applications_in_Musicology_(ADAM))
European Association for Digital Humanities - https://eadh.org/
Musical Geography Project - https://musicalgeography.org/
Current musicological projects in Czechia
Old Myths, New Facts - https://www.smnf.cz/en/
Musica Rudolphina - http://www.bibemus.org/musicarudolphina/
Genome of Melody - https://ces-transformationfund.org/our-projects/genome-of-melody/