A. M. Schlesinger (1810-1864), music publisher
- RNCM3885
- 1810-1864
A. M. Schlesinger (1810-1864), music publisher
A. Thompson-Allen Company (1952-present), organ makers
Accademia Musicale Chigiana (1932-present), conservatoire
Adagio Productions Ltd (fl.1970s)
Aeolian Quartet (fl.1940s-present)
Alberni String Quartet (fl.1960s-present)
Aldeburgh Festival (1948-present)
Aldeburgh Festival Singers (fl.1990s)
Alderley Edge Symphony Orchestra (1922-present)