Ralph (rafe) Vaughan (von) Williams wrote one for the harmonica, and one for the tuba, as well as more standard ones using a piano, viola, or one or two violins.  
Ralph (rafe) Vaughan (von) Williams wrote one for the harmonica, and one for the tuba, as well as more standard ones using a piano, viola, or one or two violins.  In more popular repertoire, Haydn wrote two for the cello, Beethoven wrote five for the piano, and Vivaldi wrote over three hundred for the violin.  For ten points, what musical genre did Bela Bartok revolutionize in 1943 when he wrote the first one for an orchestra without a featured soloist?
Ralph (rafe) Vaughan (von) Williams wrote one for the harmonica, and one for the tuba, as well as more standard ones using a piano, viola, or one or two violins.  
Concerto