The Shure SM57 is a low impedance unidirectional dynamicmicrophone made by Shure Incorporated and commonly used in live sound reinforcement and studio recording. It is one of the best-selling microphones in the world; used extensively in amplified music and by every U.S. president since its introduction in 1965. In 2004, honoring its four decades of "solid, dependable performance", it was inducted into the first-ever TEC Awards TECnology Hall of Fame.
The SM57 traces its origin to 1937 when Shure engineer Ben Bauer developed the first single-element directional microphone, the Unidyne, which had a cardioid pickup pattern. Seeler torture-tested the Unidyne III during three years of research and development, and so produced the SM series of rugged and reliable Shure microphone capsules. Seeler was an aficionado of classical music, and expected the SM57 to be used for orchestras. He "despised" rock music but the microphone ended up being one of the most widely used for amplified concerts.