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Tree‑O’s sound features lush three-part harmonies supported by a driving rhythmic accompaniment. Each member shares lead vocals throughout the set. George Haver, guitar, leads with a warm and engaging tenor voice. Rick Palkovic offers instrumental color on mandolin and Dobro, adding his high baritone to harmony and lead vocals. Jamie Knapp holds down the bottom end with the upright bass and adds harmony and lead vocals. But any of the three is likely to pick up a banjo, recorder, keyboard or other instrument if not restrained. The result is a delightfully diverse and eclectic instrumentation.

Tree‑O came together under the name Rubber Soulmates for what was originally envisioned as a one-time gig to perform acoustic interpretations of hits from the 1965 Beatles classic, Rubber Soul. They had so much fun playing together that they stayed together, quickly expanding their repertoire to include other artists and genres, as well as their own originals.

George HaverGeorge has been rocking in Northern California for three decades. His musical career began with inspiration from the folk music scene of the ’60s. Drawn to rock and roll by the British invasion, he went on to rock his way through the ’80s. He currently sings with the Vocal Art Ensemble and most recently performed with the Davis-based swingin’ trio, Dog with a Bone.

Rick Palkovic

Rick has kept his musical muse going over the years by playing a little bit of everything. Yep, there he was in the polyester disco outfit playing guitar on Chicago covers in the early ’80s. And there he was picking up Dobro and mandolin when the bluegrass band needed another instrumentalist in the ’90s, all the while keeping up his interest in jazz guitar.

Jamie Knapp

Jamie was raised on classical and Brazilian guitar. When adopting another instrument, she decided that string bass was more convenient to haul than, say, orchestral harp. But not by a lot. Palkovic and Knapp currently can be found playing jazz with Elements of Style, swing and old-time music with Flatland String Band, and duets on guitar and mandolin.