What is an A flat on trumpet?
When you play an A, you're hearing a G. When you play an F, you're hearing an E flat. This is always true for B flat trumpet. Remember that there are trumpets in other keys as well, which means those trumpets will sound different notes.
What Are the trumpet notes?
The trumpet has several “open notes” that are played without any fingerings. These are the same open notes from the harmonic series that a bugle plays and are the notes (listed from lowest to highest) C, G, C, E, G, Bb, and top C. You move between the open notes by using your lips, tightening them to play higher.