- Nisard, Theodor, from appendix
- Nissen, Georg von
- Nixon, Henry, from appendix
- Nocturne
- Nocturns
- Node
- Nodus Salomonis
- Noël
- Nohl, Carl
- None
- Nonet
- Non Nobis Domine
- Non plus ultra
- Nonne Sanglante, La
- Norcome, Daniel
- Nordisa, from appendix
- Norma
- Norris, Thomas
- Norris, William
- North, Francis
- Norwich Festival
- Nota Cambita
- Notation
- Note
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- Notot, Joseph, from appendix
- Nottebohm, Martin
- Nourrit, Louis
- Novelletten
- Novello, Vincent
- Novello, Ewer & Co.
- Noverre, Jean
- Nowell
- Nozze di Figaro, Le
- Nuances
- Nuits Blanches
- Number
- Nunc Dimittis
- Nut
- Oakeley, Herbert
- Obbligato
- Oberon
- Obertas, from appendix
- Oberthür, Charles
- Oblique Piano
- Oboe
- Oboe d'Amore
- Oboe di Caccia
- Obrecht, Jacob
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- Oca del Cairo, L'
- Ocarina
- O'Carolan
- Occasional Oratorio, The, from appendix
- Ochetto
- Octave
- Octave (organ stop)
- Octave flute
- Octet
- Ode
- Odéon
- Odington, Walter de, from appendix
- Œdipus
- Oesten, Theodor
- Offenbach, Jacques
- Offertorium
- Oginski
- Okeghem, Joannes
- Old Hundredth Tune, The
- O'Leary, Arthur
- Ole Bull
- Olimpiade
- Oliphant, Thomas
- Olympie
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