Peşrev or Peshrev (Turkish, "prelude"; pronounced [peʃˈɾev]) is an instrumental form in Ottoman music.
It is the name of the first piece of music played during a group performance called a fasıl (Turkish pronunciation: [faˈsɯɫ]).
It usually uses long rhythm cycles, stretching over many measures as opposed to the simpler usul the other major form of instrumental music uses, saz semai.
In Ottoman Turkish, peşrev combines a New Persian loanword, piš "before, ahead" and the native term rev, "that which goes".
Other composers include Tamburi Cemil Bey, Gazi Giray Han, Dimitrie Cantemir and Dilhayat Kalfa.