Gabriel Anton Walter was a builder of pianos. The Grove Dictionary of Music and Musicians describes him as "the most famous Viennese piano maker of his time".

Wolfgang Amadeus Mozart's concertos for piano and orchestra are numbered from 1 to 27. The first four numbered concertos and three unnumbered concertos are early works that are arrangements of keyboard sonatas by various contemporary composers. Concertos 7 and 10 are compositions for three and two pianos respectively. The remaining twenty-one are original compositions for solo piano and orchestra. These works, many of which Mozart composed for himself to play in the Vienna concert series of 1784–86, held special importance for him.