In the 10 months since his band was given official permission to perform, Iranian rock singer Ardavan Anzabipour has learned when to cool things down.

"People want to see some action on stage but we must be careful not to overdo it," Anzabipour, the 40-year-old lead singer of Thunder, said in a Dubai hotel last month before its debut show in the United Arab Emirates. "It's a challenge. We bring the excitement up but they're not able to move" as dancing in public is banned, he says.

Since the election of moderate President Hassan Rouhani last year, the number of Iranian bands allowed to stage concerts has surged. The post-revolution era, during which live Western- style music was restricted to underground events or impossible to find, is fading. Yet all public performances still need to be sanctioned by guardians of the Islamic republic's officially ordained values.