Motorpsycho also did a good cover of Jefferson Airplane’s The House at Pooneil Corners. I couldn’t find the Motorpsycho cover on youtube but here’s a live Airplane version:
I’d never heard of either band; that Trees version is great.
Here’s a cool cover song in which Jackie King tears it up on Bread’s "If" and Nat King Cole’s "There Will Never Be Another You".
Jackie King played guitar in Shades of Joy with Howard Wales and Martin Fierro and played on the soundtrack for El Topo. I think King still tours with Willie Nelson and band. He’s a pretty amazing guitar player and Willie Nelson’s band is awesome; the audience reaction at the end is great: