Yeah, I'm not really a big fan of just betraying others like this. The honorable thing to do would be to stay and continue rehearsing with him to prepare for the new gig. It'll cost some money, though (less than a single low-quality 12AX7-valve, though. And yes, I've checked), but if it means I get to try playing for strangers, it might be worth the money.

In the meantime, I'll keep practicing the licks, until the gig comes around. That doesn't mean I won't try to figure out how to make drum and bass lines in Ableton, though. Once I figure that out, preferably within the next two months, I'll be able to make my own music completely on my own (or I could buy a bass guitar and bass amp and record that and just learn to make drum tracks). Should make it easier to find at couple of musicians if I already have the music ready :)