On Sunday October 27, 1968 they played at the San Francisco Pop Festival and then played at the Los Angeles Pop Festival and Miami Pop Festival in December of that year as their top ten hit "Midnight Confessions" was hitting the airwaves.
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In 1970, he married the winner of the Miss World title (1961), Rosemarie Frankland.
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Entner is best known for his vocal contributions on some of The Grass Roots' best known hits, most notably the memorable "1-2-3-4" count-in to the chorus of Let's Live for Today and the Middle 8 of the song Midnight Confessions.
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The performers included bassist-vocalist Rob Grill, guitarists Creed Bratton and Warren Entner, drummer Rick Coonce, and various members of the group of LA studio-musicians known as the Wrecking Crew, including Carol Kaye playing the opening bass-line.