A virtual orchestra pit, B. Toys' Symphony in B ($40) is preprogrammed with 15 songs and symphonies. It comes with 13 instruments that can be added one at a time to the "stage" to actually create the music. So if the tuba, piano, and violin are on stage, the song sounds different than it does if the sitar, cymbals, and clarinet are there.
B Toys Symphony in B Orchestra