A Major is a key of Tongeschlechts Major, which builds on the root a. The key of A major is written in standard notation with three sharps ( F sharp, cis, gis). The corresponding scale and the basic chord in this key ( the tonic a- cis -e) are denoted by the term A- flat major.
A major is often described as a festive, bright and radiant, but cf the product key character. A major is a particularly suitable key for the song accompaniment on the guitar, as the bass notes of the A major reason cadence (d, e, a ) the three lowest - and then to be struck empty - correspond to strings of the guitar.