Sama'i (also known as usul semai) is a vocal piece of Ottoman Turkish music composed in 68 meter.

This form and meter (usul in Turkish) is often confused with the completely different saz semaisi, an instrumental form consisting of three to four sections, in 108 meter, or usul aksak semai (broken semai in Turkish).

Semai is one of the most important forms in Ottoman Turkish Sufi music.

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