I've never been in a band scratch the 8 yr old meeting of guitarists/drummers in a friend's basement, though i've always thought it would be nice to be in one. I stayed after school recently waiting for my mother, wandered into the band room, sat on the piano bench and started playing 'Lost?'. 'That one kid that sits in the corner' was near his drums at the time and he went with the song really well despite never hearing it, it was really neat considering i'm usually more of a solo player. (Perhaps because i'm the only one that can stand my own music.)
I would only get in a band with people I liked, though, as it would cause too many problems for me otherwise. Music is music, I have fun making it, as do others, but I don't enjoy arguing and fighting as much as I should.
-Find a person/people you like
-See if you flow well with them
-Discuss where you'd like to take a musical direction of a band.