Having to do with Written Music

ANA’s collection: Written music and Allspel list
CDs of Allspel tunes: Produced by Skandia (Seattle)
Henrik Norbeck: Swedish written music
Lennart Sohlman’s tunes: from Jämtland, Härjedalen and Medelpad.
Richard Robinson’s Tunebook: a lot of Swedish tunes
Scandinavian Folk Dance Music, JC’s repository of ABC & GIF files
Folkets Hus Spillefolk: Massive tune collection for Scandinavia
Blue Rose Music: A wonderful tune compilation organized by location
Musica Viva: Free Swedish sheet music directory
The folkmusic commission’s musical score collection and the music museum’s player tunebooks

ABC Files

The ABC homepage: Write music with normal text files!
ABCMUS: a $10 shareware ABC program
Abc2Win, a $20 shareware ABC program
GUI front-ends: e.g. convert ABC files to PostScript for printing.
A Tunefinder: Search the web for particular ABC tunes
Folkwiki: A growing collection of Swedish Folk Tunes in ABC and MIDI

Information on temperments and tuning:

Understanding Temperaments
Tom Lougheed’s analysis of temperments
Terry Blackburn’s guide to alternate temperments

Learning Tools

Amazing Slow Downer: Slow down CDs without changing the pitch.