O
O antiphons
O-daiko
O-uchi
Oaktag
Oban
Obbligato
Obbligo
Obelisk
Ober
Oberdominante
Oberstimme
Obertas
Obertaste
Oberton
Oberwerk
Object
Objectification
Objectivity
Objet d'art
Obligat
Oblique
Oblique motion
Oblong
Oboe
Oboe d'amore
Oboe da caccia
Obra
Obscene
Obsession
Obtuse angle
Obverse
Ocarina
Occasional piece
Occlude
Occursus
Ocher or ochre
Octagon
Octahedron
Octatonic scale
Octave
Octave bands
Octave bass clef
Octave clef
Octave designation
Octave marks
Octave treble clef
Octavo
Octet
Octobans
Octotonic
Octuple croche
Oculus
Oda
Odd time
Ode
Oenochoe
Oeuvre
Off axis
Off beat
Off-beat
Offertory
Office
Office, divine
Officer's call
Offset printing
Offset time
Ogee
Ogive
Ohm
Ohm's law
Ohne
Oil
Oil gilding
Oil paint
Oilstone
Oinochoe
Okedo taiko, oke daiko
Okesa
Oktave
Old master
Old roman chant
Oliphant
Omaggio
Ombra scene
Omni
Omni mode
Omni-directional
Omnitonic horn
Omphalos
On axis
On line
Onbayashi
Ondai
Ondeggiando
Ondes martenot
One
One-line
One-point perspective
One-voice-per-part, or ovpp
Oneiric
Ongaku
Ongakudaigaku
Ongakushi
Ongarese, all'
Online art
Onpu
Ontbijt
Ontology
Onzieme
Op
Op amp
Op.
Opacity
Opalescence
Opaque
Opaque projector
Open
Open circuit
Open edition
Open fifth
Open form
Open notes
Open roll
Open shape
Open strings
Open track
Opening
Openwork
Opera
Opera bouffe
Opera buffa
Opera comique
Opera seria
Opera-ballet
Operating level
Operational amplifier
Operetta
Ophicleide
Ophthalmology
Opp.
Oppression
Optical art
Optical mixing
Optics
Opus
Oral tradition
Oratorio
Orchestra
Orchestra bells
Orchestra leader
Orchestral horn
Orchestration
Ordinary
Organ
Organ chorale
Organ point
Organ verset
Organal style
Organetto
Organistrum
Organology
Organum
Organum purum
Orgel
Oritatami dai
Ornament
Ornamentation
Ornaments
Oroshi
Orpharion
Orphica
Oscillator
Ossia
Ostinato
Ostinoto
Oto
Otolaryngolist
Otologist
Ottava
Ottava alta
Ottava bassa
Ottava rima
Ottavino
Ottoni
Ou
Out of phase
Out port
Outboard equipment
Outer voices
Output
Output impedance
Output level
Output selector
Ouvert
Ouverture
Oval
Over easy
Overblow
Overblowing
Overdubbing
Overload
Overload indicator
Oversampling
Overstrung
Overtone
Overtones
Overture

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