Some interesting composer / performer links:

19th Century Guitar Music
Free Public Domain Music
New Millennium Guitar
Giantino Scelsi
    about (English)
Angelo Gilardino
George Antheil
Harry Partch
Peter Blanchette also director of HVGO!
Stiching Huygens-Fokker (Microtonal Music)
Slew of musicology & theory music texts online
Alain Danielou - Great writings on tuning theories.
Ernest McClain - Music Archeology
Synesthetics - Synesthesia (interrelated sense phenom)

Non- music sites:
Occult Experiments in the Home
Alchemy Web Site
Occult of Personality

Turkish and other cultural music links:
PİR SULTAN ABDAL and me
NEY
Ottoman Music
Türkü Sitesi - Halk Müziği Araştırmaları
Turkish Music Portal
Nota arşivi , Notalar, Neyzen Zeki Sözen
Transcriptions of ney taksims
Persian Music free Download
Persian Scores
Mevlevi Ayin Music (Whirling Ceremony)

Oud Links:
Mikes Ouds
Oud Cafe
David Parfitt's Oud Site