The Rolling Stones have been called the "World's Greatest Rock and Roll Band," but they're also one of the world's greatest recording innovators.
In 1968, on the advice of their piano player and road manager Ian Stewart, they commissioned a mobile recording truck, which they used to record the albums Sticky Fingers and Exile on Main Street.
That truck, The Rolling Stones Mobile Studio, is the subject of a short YouTube, The Rolling Stones and the Most Important Music Studio on Wheels.
The truck, which still functions and is part of the National Music Center in Calgary, Alberta, was also used by Led Zeppelin for their third and fourth albums, as well as Houses of the Holy and Physical Graffiti; Fleetwood Mac for Penguin; Deep Purple for Machine Head and Burn; and The Who for Who's Next; as well as recordings by Black Sabbath, Bob Marley, Iron Maiden, Dire Straits, Nazareth, Santana and Bad Company.