ABC Music Notation: Web Sites

The ABC home page is the central repository for everything about ABC notation.

Sites with large ABC music collections:

http://trillian.mit.edu/~jc/music/abc/: John Chambers' tune collection.
http://perun.hscs.wmin.ac.uk/~jra/NMD/: James Allwright's ABC version of the Nottingham Music Database.
http://www.ceolas.org/tunes/: The Ceolas tune archive. This is mostly Irish and other British-Isles music.
http://home1.swipnet.se/~w-11382/abc/index/: Henrik Norbeck's tune collection.