Music Theory

teoría - Music Theory
Dolmetsch - Music Theory
Compass extra scores
Musical terminology - Wikipedia
Music Theory For Songwriters
Ricci Adams' Musictheory.net
Google Directory - Arts > Music > Theory
Schenkerian Analysis
Chord Progressions in Tonal Music
Auto-Transposer
Soundscapes
Good Ear - Online Ear Training Site
Songs not in 4/4 Time