30 Seconds to Mars is an American rock band from Los Angeles, formed in 1998. Since 2007, the band has been composed of actor Jared Leto (lead vocals, rhythm guitar, songwriter), Shannon Leto (drums, percussion) and Tomo Miličević (lead guitar, keyboards). Following the departure of Matt Wachter (now of Angels & Airwaves) in 2007, Tim Kelleher became the bassist for the group, performing live only with both Jared and Miličević recording bass for studio recordings, while Braxton Olita (keyboards) was added to the touring lineup in 2009. Previously, the group also featured guitarists Solon Bixler (now of Great Northern) and Kevin Drake.

To date, 30 Seconds to Mars have released three studio albums – 30 Seconds to Mars (2002); A Beautiful Lie (2005); This Is War (2009) and two extended plays – AOL Sessions Undercover (2007) and To the Edge of the Earth (2008).