A colleague said Habib Meftah Bushehri was convicted in connection with a performance in France in 2006, during which their group, Shanbezadeh, played religious music.
Band leader Saeed Shanbezadeh told Radio Farda in an interview from Paris that the court issued its sentence after viewing a recording of the performance.
"The judge's interpretation is that our work is an insult to sanctities because we played [the southern Iranian city of] Bushehr's religious music," Shanbezadeh said. "The religious music of Bushehr is some of the strongest and most beautiful music in southern Iran; it's an important part of our culture. I'm surprised that someone can issue such a verdict."
Shabezadeh said Meftah Bushehri's case is being reviewed and that he is not allowed to leave Iran.
Iranian officials have not commented on the case.