30 Seconds To Mars Biography 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 & Tomo Miličević lead guitar, keyboards. Pursuing the departure of Matt Wachter, now of Angels & Airwaves in 2007, Tim Kelleher became the bassist for... more.