Conversation so far:
What did Jared Leto perform?
Jared Leto is the lead vocalist, multi-instrumentalist and main songwriter for Thirty Seconds to Mars.
What was Jared Leto's band name?
Jared Leto formed the rock band Thirty Seconds to Mars  with his brother Shannon.

Question: What year was this
Self-contained rewrite: What year was Jared Leto's band, Thirty Seconds to Mars formed?