Identify the note located at the 4th string 9th fret.

• A. A
• B. A#
• C. B
• D. C

Answer: (C)

To identify the note located at the 4th string (which is the D string) and the 9th fret, it is helpful to understand how the guitar fretboard is laid out in terms of musical notes.

Starting from the open D string, the notes follow this pattern as you move up each fret:

• Open string (0) is D,

• 1st fret is D# (or Eb),

• 2nd fret is E,

• 3rd fret is F,

• 4th fret is F# (or Gb),

• 5th fret is G,

• 6th fret is G# (or Ab),

• 7th fret is A,

• 8th fret is A# (or Bb),

• 9th fret is B.

Counting up from D, each fret corresponds to a half-step increase in pitch. Thus, when you reach the 9th fret on the 4th string, you land on the note B.

This understanding of how the notes are organized on the fretboard leads to the correct identification of the note at that position, confirming that the note at the 4th string 9th fret is indeed