Key (instrument) Key (instrument) A key is a specific part of a musical instrument. The purpose and function of the part in question depends on the instrument. On instruments equipped with tuning machines, violins and guitars, for example, a key is part of a tuning machine. It is a worm gear with a key shaped end used to turn a cog, which, in turn, is attached to a post which winds the string. The key is used to make pitch adjustments to a string. With other instruments, zithers and drums, for example, a key is essentially a small wrench used to turn
Boston Musical Instrument Company Boston Musical Instrument Company. This change coincided with a relocation to 51 Chardon Street in Boston. Two years later the company was purchased by Cundy-Bettony which continued to build instruments in the Boston name until 1928. The Boston Musical Instrument Manufactury/Company was a producer of traditional instruments for brass band. The 1869 catalog shows a full line of such instruments including the traditional cornets in E-flat and B-flat, E-flat Alto horn and horn, B-flat tenor, B-flat baritone, B-flat valve trombone and slide trombone, and tubas in B-flat and E-flat. Slide cornet was another option. The company also offered the full