Thanks Joe, that answered the question nicely.
I've heard some of that Zephyr stuff (the tracks in the Tommy Bolin 2 disc collection), never heard the entire albums. I need to see if I have that "Sister Andrea" track, that sounds killer by description.
Bolin never sounded "comfortable" playing in straight rock bands to me, he might have made more money that way, but I think his spirit was more adventurous. Unfortunately, his "habits" were quite pricey and a gig in Deep Purple probably helped keep that going.