- Airy, George
- A'Kempis, Florentino
- Akeroyde, Samuel
- Ala, Giovanni
- Alard, Delphin
- Albani, Mathias
- Albeniz, Pedro (1755–1821)
- Albeniz, Pedro (1795–1855)
- Albergati, Pirro
- Albert, Heinrich
- Albert, Prince
- Albertazzi, Emma
- Alberti bass, from appendix
- Albinoni, Tomasso
- Alboni, Marietta
- Albrechtsberger, Johann
- Albumblatt
- Alceste
- Alchymist, Der
- Alcock, John
- Alday
- Aldovrandini, Giuseppe
- Aldrich, Henry
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- Alessandro, Romano
- Alexander Balus
- Alexander, Johann
- Alexander's Feast
- Alexandre Organ
- Alfieri, Pietro, from appendix
- Al Fine
- Alfonso und Estrella
- Alford, John
- Aliani, Francesco
- Ali Baba
- Aliprandi, Bernardo
- Alizard, Adolphe
- Alkan, Charles
- Alla Breve
- Allacci, Leone
- All' Antico
- Allegranti, Madalena
- Allegretto
- Allegri, Gregorio
- Allegro
- Allemande
- Allen, Henry, from appendix
- Allgemeine Musikalische Zeitung
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- Allison, Richard
- All' Ottava
- All' Unisono
- Alpenhorn
- Alphabet
- Alsager, Thomas
- Alt
- Altenburg, Johann
- Alternativo, from appendix
- Altes, Ernest, from appendix
- Althorn
- Altnikol, from appendix
- Alto
- Alto (instrument)
- Altra Volta
- Alvsleben, from appendix
- Amati
- Ambassadrice, L'
- Amber Witch, The
- Ambrogetti, Giuseppe
- Ambros, August
- Ambrosian Chant
- Amen
- American Organ
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- Amicis, Anna de
- Amicis, Dominico de'
- Amilie
- Amner, John
- Amner, Ralph
- Amorevoli, Angelo
- Anacker, August
- Anacreon
- Anacreontic Society
- Analysis
- Analysis of Compound Musical Sounds
- Anapæst, from appendix
- Ancient Concerts
- Andacht, mit, from appendix
- Andamento, from appendix
- Andante
- Andantino
- Ander, Aloys
- Anderson, Lucy
- Andre, Johann
- Andreoli family
- Andreoli, Giuseppe
- Andreoni
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