So I got access to many professional Big Band charts. I play to them on drums, but I think it would be cool to play to them on my keyboard. I know all the basics of a keyboard, because I'm a percussionist, and I know this will sound stupid, but what's Fm7 or Bb7 mean and how the Fuck do you play them. I believe they're chords, but what's the 7 mean??
play the Ab note just below middle C, and also the Eb right above middle C. then play the F that is 2 and a half octaves below middle C. that is the Fmin7 chord. now for the other chord, keep all the notes the same but for the bass note, play Bb instead of F, and that high Eb move it down to D. that is how you play those 2 chords, in the context you are referring to