Jimmy Martin, one of the greatest vocalists in bluegrass, died Saturday in a Nashville hospice where he was battling bladder cancer. In 1949, Martin replaced Mac Wiseman in Bill Monroe's Blue Grass Boys, the premier bluegrass group, and served as the group's guitarist and lead vocalist until 1954. In 1972, Martin joined such other country and bluegrass legends as Maybelle Carter, Doc Watson, Roy Acuff and Earl Scruggs on the Nitty Gritty Dirt Band's album "Will the Circle Be Unbroken," a landmark merger of rock and country talent.

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