Sigma Sound is credited with well over 200 gold and platinum awards with an extensive client list that includes Harold Melvin & the Blue Notes, The O'Jays, The Spinners, MFSB, David Bowie, Teddy Pendergrass, Patti LaBelle, The Roots and others.

[1] From 1977 through 1988, the studios also operated a New York City location in the Ed Sullivan Theater building, which hosted recording projects by artists including Talking Heads, Madonna, the Ramones, Aretha Franklin, and the B-52s.

Rec-O-Art was a mono-only recording facility with a 40-foot long room and a 6x12x40 foot echo chamber where Tarsia had previously done service technician work.

[2] Tarsia opened his new recording studio, renamed Sigma Sound, in August 1968, hosting sessions for Gamble and Huff, Weldon McDougal, and The Delfonics on the first day.

They included Bobby Martin,[5] Norman Harris, Thom Bell, Ronnie Baker, Vince Montana and, later, Jack Faith, Dexter Wansel, and John Usry.

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.

[9] In 1972, the O'Jays recorded their breakthrough album Back Stabbers at Sigma Sound, along with its hit single "Love Train", one of the first disco songs.

[10] Other artists who experienced commercial success working with Gamble and Huff, Philadelphia International, and Sigma Sound Studios included Harold Melvin & the Blue Notes, The Spinners, and Teddy Pendergrass.

[13] The varied list of artists attracted by the studios' success included the Trammps, The Manhattans, Robert Palmer, Melba Moore, the Salsoul Orchestra, The Ritchie Family, Grace Jones, Loleatta Holloway, Linda Clifford, Gloria Gaynor, John Travolta and others.

Other artists who recorded at Sigma Sound's New York studios include Rick James, Aretha Franklin, the B-52s, the Ramones,[17] Whitney Houston, Steely Dan, Roy Ayers, Ashford & Simpson, Paul Simon and others.