Upon their breaking into the bluegrass scene, the Osborne Brothers quickly became known for their virtuoso instrumentation and tight, melodic vocal harmonies. They first made the country chart in 1958 with "Once More", performing as a trio with Red Allen. The song featured a novel inverted stacked harmony. Bobby sang the lead line highest, with Sonny singing baritone, and the third singer (Red Allen) singing tenor as the lowest part. This made Bobby's distinctive voice the lead, and the third voice was somewhat interchangeable. As a result, they could hire others guitarist and singers without changing the overall sound. The "high lead" vocal trio became their signature, and they used to great effect in the country market with songs like "Blame Me", "Sweethearts Again", and a remake of the Carter Family's "Fair and Tender Ladies".