The [Three] Suns have remained the same over the years. But as on other of their recent hits, they've added instruments. They've got some novel ones here: chimes, bells, an oboe, and two tubas.
One of the tubas was Harvey Phillips. I am not aware of another tuba player. Oftentimes multiple sideman split an LP-- in the event the session was recorded over a number of days (and he/she had a commitment on the other date).