If you've ever had a shiny, brand new car, you may have found yourself volunteering to drive a lot more than you used to. Take the kids to soccer practice? Sure. Go pick up a loaf of bread? Love to. Johann Sebastian Bach was in pretty much the same place in 1719. He had just gotten a shiny, brand new harpsichord, and desperately wanted to take it out for a spin. So he wrote a flashy harpsichord part into the piece he was working on, his Brandenburg Concerto No. 5. We'll hear Bach's shiny new set of wheels, from a concert in Germany.