What note corresponds to the 4th string 9th fret?

The note that corresponds to the 4th string (which is tuned to D) at the 9th fret is actually B.

To understand this, we start by recognizing the standard tuning for a guitar's strings, which from lowest to highest is E, A, D, G, B, and E. The 4th string, tuned to D, follows a sequence of notes as you move up the frets. Each fret represents a half step (or semitone) up from the previous fret.

Starting from D at the open string (0th fret), we can map out the notes on each fret as follows:

• 1st fret: D# (or Eb)

• 2nd fret: E

• 3rd fret: F

• 4th fret: F# (or Gb)

• 5th fret: G

• 6th fret: G# (or Ab)

• 7th fret: A

• 8th fret: A# (or Bb)

• 9th fret: B

Thus, on the 4th string at the 9th fret, the note played is indeed B. This note aligns perfectly with the pattern of the Western music