Grill was asked to join The Grass Roots, which grew out of a project originating from Dunhill Records owned by Lou Adler. Writers/producers P. F. Sloan and Steve Barri (The Mamas & the Papas, Tommy Roe, Four Tops and Dusty Springfield) were asked by Dunhill to write songs that would capitalize on the growing interest in the folk-rock movement. After their song “Where Were You When I Needed You” — recorded as a demo with P.F. Sloan as lead singer — was released under the name “The Grass Roots” and received airplay in the San Francisco Bay Area, Dunhill searched for a band to become The Grass Roots. After the first group they chose departed, a Los Angeles band composed of Creed Bratton, Rick Coonce, Warren Entner, and Kenny Fukomoto was recruited to become The Grass Roots.