Billy Sherwood
"besides including the main trio, also includes a few guest artists. One is prog rock's multi-instrumentalist Billy Sherwood. Billy Sherwood is behind the keyboard playing sounds you'd ever want to hear. Andy Walter at Abbey Road Studios in London, England, mastered Sons of Hippies: The Griffons at the Gates of Heaven. The same walls hearing the sounds of old psychedelia of the day. Fits the whole package here very well".