Band practice is a little different in Camp Liberty.
The former U.S. military base in Iraq houses some 2,000 members of an exiled Iranian opposition group called the MEK, or Mojahedin-e-Khalq.
In October, an Iran-backed Shia militia took credit for a rocket attack that killed over 20 Camp Liberty residents. Three days later, a group of musicians calling themselves Music Ashraf responded with a music video they wrote, performed and produced.
"The moment I realized how horrific the missile barrage was and how many of my friends had been killed, I conceived the idea of writing and performing this song," Rouzbeh Emadzadeh, Music Ashraf's lead singer, said.
5 Things You Didn't Know About The MEK
1. Its leader is a woman
Maryam Rajavi is one half of the husband-and-wife duo at the center of the MEK.
She runs the organization's parliament-in-exile in Paris; her husband's whereabouts are unknown. She's has made gender equality one of the MEK's main platforms. Today, women make up half the group's leadership council.
2. It was once labeled a terrorist group
In 1997, the US designated the MEK a terrorist organization -- a decision widely interpreted as a goodwill gesture to Tehran's then-newly elected president. The State Department pointed to allegations the MEK was involved in the killing of several Americans in the '70s and an attempted attack on Iran's mission to the United Nations in 1992. The group maintains it played no role in the attacks, which it says were carried out by Iranians unaffiliated with the MEK.
The MEK publicly renounced violence and disarmed in 2003. Following an intense lobbying effort by the group, the Obama administration took the MEK off the terrorist list in 2012.
3. They have friends in Washington
A long list of current and former US officials give paid speeches at the group's annual rally in Paris.
Past speakers include former Sen. John McCain, former Vermont Gov. Howard Dean, New York Mayor Rudy Giuliani, retired General Wesley Clark, former Pennsylvania Gov. Ed Rendell, ex-State Department spokesman P.J. Crowley and former U.S. Ambassador to the United Nations John Bolton.
4. Some call it a cult
Ex-MEK members have described the group forcing its followers to divorce their spouses and pledge lifelong celibacy. Others say devotion to the Rajavis borders on hero worship. The MEK dismisses the cult allegations.
5. They want a nuclear-free Iran
The group says it provided the U.S. with sensitive information regarding Iran's nuclear ambitions. In 2002, it revealed the existence of Iranian nuclear facilities at Arak and Natanz.