 As a sideman, Rosenthal has performed in small groups led by Art Farmer, Jon Faddis, Phil Woods, and Jay Leonhart.He has also performed with Wynton Marsalis and the Lincoln Center Jazz Orchestra, the Carnegie Hall Jazz Band, the Westchester Jazz Orchestra and the Vanguard Jazz Orchestra.Rosenthal is the pianist of choice for many top jazz vocalists including Helen Merrill, Mark Murphy and Ann Hampton Callaway.