What is the note at the 5th fret of the 3rd (G) string?

The note at the 5th fret of the 3rd string, which is tuned to G, is indeed a D note. Each fret on a guitar represents a half step in pitch. The open 3rd string, when played without any fretting, produces a G note. Moving up to the 1st fret raises it to G#, the 2nd fret to A, the 3rd fret to A#, and the 4th fret to B. When you reach the 5th fret, it raises the pitch one more half step to C. Therefore, reaching the 5th fret on the G string is representative of the following progression: G --> G# --> A --> A# --> B --> C. By understanding this pattern, you can apply the same principle across all strings and recognize the note at the given fret accurately.