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FAQ: What are Sharps and Flats in music?
Q: You keep referring to G sharp this and A flat that. What does it mean?
A: On the guitar, the jump between two notes like G and A is called a whole-tone. Well, where there's a whole there's usually a half. The half notes between the whole tone keys are called semi-tones, or in more regular notation - sharps and flats.
In most cases, a sharp raises the pitch of a note one semitone while a flat lowers it a semitone. That means that D sharp (D#) is the note between D and E. And B flat (Bb) is the note between A and B.
Think of these notes as the notes in between the whole tones like G, C and A. This is exactly the way the piano portrays them. On the piano the black keys between the white ones represent the sharp and flat notes.
This is what it would look like on the guitar...