I read a little, listen a lot and primarily play by ear. I've always wondered what the number represents next to a chord or note, i.g., Cm5 or C7 or Bm3. I know when I look at piano books the numbers refer to the octave your at but in this bass book I have they list everything as n7 or n5? Trying to figure out what this means. Also this basic blues book I'm referring to states that the blues scale is: 1 - 3b - 4 - 4# - 5 - 7b - 8 But both the E and A scale they show: 1=E - 3b =G and 1=A - 3b=C?? Doesn't make sense?