Take the 'one-half of the contracted amount' but insist on getting paid in advance. THEN.....show up with an Ipod and play it through the 'other' band's PA system during the band's breaks. Of course, you may STILL end up in small claims court, PRAYING for an incompetent judge.

Seriously, depending on the amount of money, I'd probably just suck it up and chalk it up to another one of life's lessons.

chas