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Entering between the two naked performers forces those with tickets into a "confrontation between nakedness, and the gender, the sexuality, the desire", the Royal Academy's head of exhibitions Andrea Tarsia has said.

The recording engineer Joe Tarsia, the founder of Sigma Sound Studios, where most of the hits associated with the Sound of Philadelphia were made, was fond of calling Mr. Bell the “Black Burt Bacharach.”

In the early 1970s alone Mr. Tarsia captured the sound of dozens of acknowledged Philadelphia soul classics, including the Stylistics’ “Betcha by Golly, Wow,” the Spinners’ “I’ll Be Around” and Harold Melvin & the Blue Notes’ “If You Don’t Know Me by Now.”

“TSOP” was among Mr. Tarsia’s collaborations with Gamble and Huff that topped both the R&B and pop charts, as were the O’Jays’ “Love Train” and Billy Paul’s “Me and Mrs. Jones.”

Mr. Tarsia was known to refer to the sumptuous strings, syncopated rhythms and gospel-bred call and response of the Philadelphia sound as “Black music in a tuxedo” — an aesthetic he in no small way shaped through the richness and clarity he lent to so many recordings.