Bassist-singer Rob Grill, lead vocalist for the hitmaking L.A. pop band the Grass Roots, died July 11 of unknown causes in a hospice facility in Lake County, FL. He was 67.Grill fronted the third iteration of the Grass Roots, which began life in 1966 as a studio project of songwriters P.F. Sloan and Steve Barri. He replaced the original bassist in an L.A. group called the 13th Floor, which took on the Grass Roots name after they were signed to Dunhill Records. The label had released “Where Were You When I Needed You,” the Grass Roots hit penned by Sloan and Barri, and wanted to sustain the chart-proven moniker it owned. Grill took the lead on the group’s biggest chart successes, “Let’s Live For Today” (No. 8, 1967), “Midnight Confessions” (No. 5, 1968) and “Sooner Or Later” (No. 9, 1971). The group rang up 11 top 40 hits, all produced by Barri, before disbanding in 1975. Grill recorded a solo album, “Uprooted” with the members of Fleetwood Mac in 1979. In 1982, he re-formed the Grass Roots with new members, and kept the group on the road as a popular oldies act into the new millennium.