Hello. i seem to be getting quite flowy at reading and playing to sheet music. however i bought two books on playing blues and jazz and above the score there is a mention of be flat and e flat saxes next to them they have what looks like a chord or scale indicator. for example on a teack called "hard hearted hannah" on the top three bars above the score there is written: b flat sax. F c7Aug F c7aug F C7aug F F7. these looks likes chords. what''s the purpose of these in respect to me? I play tenor.