The Hammond organ – it's heavy, it's hard to move, you basically become a lifelong van owner if you play one, and I've often said, "If your back doesn't hurt – it doesn't sound right." But I have to ...

If you know organs, the sound of the Hammond is instantly recognizable. (SOUNDBITE OF ORGAN MUSIC) MARTIN: In the 80 years since the Hammond organ hit the assembly line, it has made its way into rock, ...