Though I'm not likely to need tickets for any gigs or conferences in the US any time soon, itickets is also a great site for free music downloads - they post three new tracks each week.
First go here and sign up for their emailing list. Then go back and download away. The songs are changed weekly but because I'm a super genius here's a couple of great tunes you can get from previous weeks.
To The Service - I Am Terrified
Worship with screaming & odd time signatures. Great!
Lay My Burdens - Disciple
Nice slice of gospel-tinged southern rock.