I'm 45, a semi-pro piano player as a kid, I hated it. Quit at 16, fast forward... Didnt touch anything for many many years. I got invited to a jam session by a lead, a total pro metal guitarist. My interest has been songwriting, off and on last 10? years, I suck at guitar, write riffs I play like crap, maybe I can pull bass off Dont know what I'm doing, hey whatever. I've never done anything like this, I dont know the rules. I've looked around here a lot, learned a lot. Sooo. What are the rules so that I dont make an a$$ out of myself?