<human>:  When did the Muscle Shoals Sound start?
<bot>: The Muscle Shoals sound was developed in the 1960s. It is a recording technique that is still used today. The technique involves recording a band live in a room with no microphones. The musicians are recorded playing their instruments and singing live, and the resulting audio is then mixed together to create a full-band recording. This technique is still used today to record many bands and singers.