Hey, if you know your scales, you can figure out the chords for any key signature. Hell, half the time I'll play a chord and mess around with it untill I get a chord like Am13sus4#11 or something. Thats were theory has come in handy for me. If I dont know a chord, I can easely figure out what its called by jotting down a couple octaves of a scale and doin some paperwork.