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Aerophone: An aerophone is any musical instrument which produces sound primarily by causing a body of air to vibrate, without the use of strings or membranes, and without the vibration of the instrument itself adding considerably to the sound. It is one of the four main classes (class 4) of instruments in the original Hornbostel-Sachs scheme of musical instrument classification. The other three are idiophone, membranophone and chordophone. A fifth class, electrophone, was added in a later revision. Hornbostel-Sachs divides aerophones by the fact whether vibrating air is contained in the instrument itself or not. The first class includes instruments where the vibrating air is not contained by the instrument itself, such as the bullroarer. Such instruments are called free aerophones. This class includes free reed instruments, such as the harmonica, but also many instruments unlikely to be called wind instruments at all by most people, such as sirens and whips. The second class includes instruments where the vibrating air is contained by the instrument. This class includes almost all the instruments generally called wind instruments in the west, such as the flute, the oboe and the trumpet.

A & R	A-B Stereo	A-Time
A-weighted	A/B	A440
AAC - Advanced Audio Coding (also MPEG-2 AAC)	AAF	Abalam
Abalone	ABS	Absolute Phase
Absorption	Absorption Coefficient	Alternating Current (AC)
AC-1	AC-2	AC-3
Academy Curve	A cappella	Accent
Access Time	Accidental	Accompaniment
Accumulator	Accutronics Reverb	Acetate
Acoustic-electric Guitar	Acoustic Cloud	Acoustic Foam
Acoustic Lens	Acoustics	Acoustic Suspension
Acoustic Treatment	ACPI	Action
Actionflo	Active	Active Sensing
Actuator	Adagio	ADAT
ADAT/FST	ADAT Optical	ADB
A/D Converter (ADC)	Additive Synthesis	Adjusto-Matic
ADPCM	ADR	ADSR
Aeolian Harp	Aerophone	AES
AES/EBU	AES3	AES3id
AES42-2001	AFL	AFM
Aftertouch	AFTRA	Agathis
AGC	Aggregate Device	Aging Toner
Agitato	Agoya	AGP
AHDSFR	AIFF (Audio Interchange File Format)	AIR
AIT	Alder	Alder
Aleatoric Music (Composition)	Algorithm	Alias
Aliasing	Alkaline Battery	All-Button Mode
All-Notes-Off	Allegro	Alnico
Alteration	Altered Chord	Alternate Tuning
Alto	AM	Ambience
Ambisonics	Amen Break	Amperage
Ampere	Amp Head	Amplifier
Amplifier, Instrument	Amplitude	Amplitude Modulation
AMS	Analog	Analog Sequencer
Analog Synthesizer	Anamorphic	Andante
Anechoic	Anode	Anodize
Anodized	ANSI	ANSI A-Weighting
Antecedent and Consequence	Antenna	Antenna gain
Anti-Imaging Filter	Anti-Aliasing Filter	Anti-node
Aperiodic	API	Apoyando
Apple Talk	Application (Program)	Architecture
Archival Stability	Archive	Archtop Guitar
Arco	ARP Avatar	Arpeggiator
Arpeggio	ARP String Ensemble	Arrangement
Articulation	Artifact	Artificial (or Automated) Double Tracking or ADT)
ASCAP	ASCII	Ash
Ashtray Bridge Cover	ASIC (Application Specific Integrated Circuit)	ASIO
Aspect Ratio	Asperity	ASPI
Asynchronous	ATA	ATA-2
ATA 66/100/120	ATAPI	Absolute Time Code
Atonal Music	ATRAC	ATRAC
Attack	Attenuation	Attenuator
Audio	Audiobook	Audiology
Audio RIP	Audio Suite	AudioUnits
Audiowire	Auditory Cortex	Auditory System
Augmented Interval	Auranomic	Author
Authorization	Authorize	Auto-Glide
Auto Accompaniment	Autolocate/Autolocator	Automata
Automatic Mixer	Automation	Auto Punch
Aux Send	AVI	AWG (American Wire Gauge)
AWM	Axe	Axial Room Mode

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