Not sure if this was already posted in the past, but there is an attractively presented collection of sheet music books to be downloaded from this website:
There is a compilation of sheet music and a short bio for each of the following composers: Zakharia Khanendeh, Khmayyis Tarnan, Tanburi Cemil Bey, Sayyed Darwish, Tatyos Efendi and Darvish Khan.