Please join me there A a cappella A440 AABA abduction and adduction (of vocal folds) accelerando accent acceptance angle acciaccatura accidentals accompaniment acid rock acoustic acoustic guitar acoustic intensity acoustic power ACOUSTICS acoustics of buildings action active adagio added tone chord additive synthesis ADSR Aeolian aerophone aleatory music aliasing allargando allegro alternate picking alternative guitar tunings alto ambience ambient microphone amplifier amplitude anacrucis andante animato anticipation antiphonal appoggiatura arco arpeggio arrangement articulation arytenoid cartilages aspiration atonal attack audio spectrum augmented augmented scale