IF ONLY YOU KNEW, sung by the spanish singer Susan Valery, is the second single taken from TSSOP, the new project with which Fab Merrett pays homage to Philly Soul, the musical genre born in Philadelphia in the 70s in the Philadelphia musical environment around the work of authors and record producers such as Kenny Gamble, Leon Huff and Thom Bell, defining the style of black music for over a decade.