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. When Gisela Voss, chief toymaker at B. Toys, introduced me to it, I was mesmerized. I couldn't stop playing around with the pieces and seeing what the different combinations would make — and neither could my kids.