| Keyword | Excerpt (click on keyword for complete article) |
| A piccolo flageolet | A very small piccolo flageolet tuned in A. |
| A piccolo trumpet | Small trumpet tuned a major seventh higher than the common Bb trumpet. |
| À prima vista | It.: "At sight". |
| À Punto | It.: "At the point". String instruments play with (or near) the point of the bow. |
| A quenilla | A quenilla tuned in A.Tis is the largest of the quenillas. Anything bigger than this is regarded as a regular quena flute. |
| A. R. Jollie | See Jollie, Allen R. |
| A. Rampone & B. Cazzani | See Rampone & Cazzani. |
| A. Richter | See Richter, Anton. |
| A. Rosati | Accordion brand. |
| A-scale banjo | A small five-string banjo intended to be tuned one whole note higher than the regular five-stringer.Gold Tone calls a banjo of this size a "travel banjo" and it's also occasionally refered to as a ban |
| A signal horn | |
| A smallpipes | A set of small Northumbrian smallpipes tuned in A. |
| A Sopranino recorder | The "Catalogue of the Adam Carse collection of old Musical Wind Instruments" includes a small recorder tuned in A (actually A flat) a sixth higher than a regular soprano recorder and between a soprani |
| A soprano recorder | A recorder slightly larger and tuned a minor third lower than a regular soprano recorder. |
| A. Stathopoulo | Short for Anastasios Stathopoulo. The original name of the Epiphone company. |
| A-stil mandolin | See A style mandolin. |
| A style mandolin | An archtop mandolin design introduced by Gibson around 1900. Originally the A style mandolin had a round sound hole, but when Lloyd Loar joined Gibson in the 1920s, he redesigned it with f holes. |
| À tempo | It.: "In time". Back to the original tempo. |
| A tenor recorder | A recorder slightly larger and tuned a minor third lower than a regular tenor recorder. |
| A tin whistle | |
