| Accidentals |
| Signes of sharp, flat, natural prefixed to a note, double sharp, double flat that modifies the tone of the sounds. |
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| Accompaniment |
| Rhythm or melody useful to give support and to make more rich the principal melody |
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| Alberti bass |
| Accompaniment form used with the keyboard intruments . The left hand plays the broken chords or arpeggios and the right hand plays the melody. |
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| Arpeggio |
| The sounding of the note of a chord in rapid succession. |
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| Any arpeggio could be expanded by repeting some of its notes in a diferent octave. |
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| Atonality |
| Having no key,the abscence of key or tonal center(tonic). |
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| Augmentation |
| The lengthening (usually doubling)of the time-values of notes in a melody or theme. |
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