A
a cappella
a due
A440
AABA
abduction and adduction (of vocal folds)
accelerando
accent
acceptance angle
acciaccatura
accidentals
accompaniment
accordion
acid rock
acoustic
acoustic absorption
acoustic guitar
acoustic intensity
acoustic power
ACOUSTICS
acoustics of buildings
action
active
adagio
added tone chord
additive synthesis
ADSR
Aeolian
Aeolian harp
aerophone
agogic
al niente
Alberti bass
album
aleatory music
aliasing
allargando
allegro
allemand
alternate picking
alternative guitar tunings
alternative music
alto
ambience
ambient microphone
ambient music
amplification
amplifier
amplitude
anacrucis
ancient Greek instruments
andante
animato
anticipation
antiphonal
appoggiatura
arco
aria
arpeggio
ars antiqua and ars nova
arrangement
v art rock
artificial harmonic
arytenoid cartilages
aspiration
atonal
attack
attenuation
audio spectrum
augmented
augmented scale
aulos
auxiliary note