| Term | Definition |
| a capella | music sung without instrumental accompaniment |
| a tempo | return to the original tempo |
| accelerando | becoming faster |
| accidentals | symbol used to raise or lower a given pitch by 1 or 2 semi semo-tones, or to cancel a previous sign or part of a key signature |
| adagio | slow, leisurely tempo |
| al fine | to the end, generally used after repitition |
| alla breve | a tempo marking indicating quick double time |
| allegretto | slightly slower than allegro |
| allegro | fast |
| allegro con spirito | fast tempo with spirit |
| amabile | sweet, loveable |
| ancora meno mosso | once more, but a little slower |
| andante | rather slow, at a moderate walking pace |
| aria | a self-contained competition for solo voice, usually with instrumental accompaniment and usually found within the context of an of an opera, oratorio or cantata |
| arpeggio | the notes of a chord played in succession to one another |
| atonal | music that lacks a tonal center; absence of key |
| augmented | raised or enlarged. Generally refers to the raising of a pitch by one half-step |
| ballad | a strophic, narrative song |
| berceuse | a lullaby |
| cadenza | an improvised or written-out ornamental passage performed by a soloist usually near the final cadence |