The 13th Floor were signed to Dunhill Records in an arrangement that required them to assume the identity of the Grass Roots, a name associated with a string of previously issued singles and one album, produced and mostly written (and occasionally sung) by the composer/producer team of P.F. Sloan and Steve Barri (who had previously failed in their efforts to get another band, the Bedouins, to take on the role of the Grass Roots). With Entner, Grill, Bratton, and Coonce, the effort succeeded, however, and within a few months the Grass Roots were riding high on the charts with "Let's Live for Today," a perfectly crafted folk-rock-pop single that heavily featured Grill and Entner's vocals. Although they weren't known for their originals, all four of the members composed songs, and Grill and Entner were easily the most prolific among them, sharing many copyrights as well as earning places on various single B-sides. Entner was also highly visible in their performances, usually out in front with Grill in their television appearances and on-stage.
And while their records, especially in the early days, relied heavily on contributions from outside studio musicians, the surviving evidence of the group's live performances demonstrates that the musicianship of Entner and the other bandmembers was perfectly fine -- and even occasionally elegant -- and well suited to the needs of an AM radio-oriented pop band. The group's various hits, including "Midnight Confessions" (which also showcased Entner's organ playing) and "The River Is Wide," would keep him in the spotlight (alongside Grill) well into the 1970s, long after Bratton and Coonce had left the lineup. Entner remained with the band until 1973, leaving the Grass Roots after the Alotta Mileage album. He was involved on the production side of some of the group's later work on which he participated, and later went into music management. In more recent years, he has represented such acts as Rage Against the Machine and Faith No More. ~ Bruce Eder, Rovi