All sorts of links to musical programs and handy tools
Larry Solomon's site with much information on composing and links to other information
Open directory Links to a huge amount of information, tutorials, articles etc.
Excellent well dressed site with musical lessons and other information
Mike Legge has a site about a very original musical theory (healing music)
The Art of Fugue
Excellent site with good information on chords and harmony theory
Godfried-Willem Raes has e.g. an interesting page about fugue's and more
Kunst Der Fuge
has a clear page on specially
form of fugues based on the original version of Hugo Norden
Andrew Milne has a very good site with exhaustive information about scales, tonality, chord progression etc. with clear explanation