Hammamizade İsmail Dede Efendi as a composer of Turkish classical music.
Dede Efendi gave lessons in Turkish music to Hamparsum Limonciyan who developed the Hamparsum notation, the dominant notation for Turkish music.
One of the greatest Turkish composers, he has created masterpieces in all forms and modes of Turkish music. He has also developed the composite musical modes of "sultanî yegâh", "nev-eser", "saba-buselik", "hicaz-buselik" and "araban kürdî". His greatest works are the seven Mevlevi pieces for Samah. More than two hundred of his compositions are available today.