Yes, Jared Leto has been a certified heartthrob for more than 15 years now. But unlike many actors who moonlight in vanity acts, Leto makes serious work of his decade-plus-running band, 30 Seconds to Mars. In fact, it was as an aspiring musician that he first headed to L.A., at age 21. Acting was just a side gig to pay the bills at first, until the accolades and big film roles started rolling in. And at the late-'90s height of Jared Leto frenzy, phase one, it was back to music he turned, at least part-time. He formed 30STM, as it's known to its many seriously devoted fans, with his brother and some friends around 1998. And although there have been some lineup changes, it's been an ongoing. real band since, with regular live performances and tours.