What note is played on the 12th fret of the 2nd string?

The note played on the 12th fret of the 2nd string, which is the B string on a standard-tuned guitar (E A D G B e), is indeed a B note. When you play the B string open, it is tuned to B.

When you press down on the 12th fret, you are essentially playing the same note one octave higher. Each fret on the guitar represents a half step or semitone increase in pitch. Therefore, moving from an open string to the 12th fret raises the pitch by twelve half steps, resulting in the B note again, but at a higher octave.

In standard tuning, understanding the pattern of the notes on the fretboard is essential for navigating and identifying notes quickly, making this knowledge fundamental for players to develop their skills on the guitar.