Sigma Sound Studios

Sigma Sound Studios was a recording studio in Philadelphia, Pennsylvania. It was founded in 1968 by recording engineer Joseph Tarsia.

Located at 212 North 12th Street in Philadelphia, Pennsylvania, it was one of the first studios in the United States to offer 24-track recording and the first anywhere to successfully employ console automation. Tarsia, formerly chief engineer at Philadelphia's Cameo-Parkway Studios, also opened Sigma Sound Studios of New York City in 1977, at the Ed Sullivan Theater building.

From its beginning, Sigma Sound was strongly associated with Philadelphia soul and, in the 1970s, the sound of Gamble and Huff's Philadelphia International Records (its driving rhythm a precursor to disco music), as well as the classic, sophisticated productions of Thom Bell. Both featured large productions with strings and horns creating what became known as the "Philadelphia Sound". Their success attracted many artistes and producers from various music genres across the US, as well as Europe and Japan. By the late 1970s, Sigma was operating 10 music rooms on a 24-7 schedule. Sigma's long-time general manager, Harry Chipetz, managed the business operations and worked hand-in-hand with Tarsia in developing a staff that numbered close to 50 at its peak. Sigma is credited with well over 200 gold and platinum awards with an extensive client list that begins with Aretha Franklin and ends with ZZ Top.

David Bowie recorded much of his album Young Americans in August 1974 at Sigma Philadelphia. Madonna used the New York studios to record her 1983 debut album, Madonna. On April 15, 1972, singer-songwriter and pianist Billy Joel and his touring band played an hour-long concert at Sigma Studios. The recording of "Captain Jack" from this event received extensive radio play in the Philadelphia area, long before Joel became widely known, which helped him establish a national following.

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