Also, if you want to read off of a music sheet (with notes), this may help:
-----------------------------------A
G
-----------------------------------F
E
-----------------------------------D
C
-----------------------------------B
A
-----------------------------------G
this is a staff (5 lines), if a note is on a line or in a space, it sorresponds to those letters above (in bass clef). These notes continue abouve the staff, and below the staff in the same order you see there. this is a chromatic scale (increases by ONE semi-tome (or one fret)):
Starting on E (the lowest note on a normal 4 stringer)
E F F# [G] G# A A# B C C# D D# E F G G# [A] A# B
(boxed letter correspond to the lowest and highest note on the staff above)
an A# is the same thing as a Bb, a C# is the same thing as a Db, etc...
PS, most music will have a key signature (the bunch of #s or bs at the begining of the staff after the clef) these mean that ALL notes of that letter are sharp or flat unless otherwise indicated.
hope this helps
