purchase [Fresh Cream]
I really, honestly had not planned it so that it would so coincidental, but .. back to Wheels of Fire because Jack Bruce was so multi-intrumental that he also played woodwinds on the album.
As a kid, my first instrument was the recorder; we had a quintet or maybe even a setext of alto, soprano and even one tenor recorders in the fanily at one point (I still have posession of my father's tenor recorder - looks like a clarinet in size - definitely not your typical school recorder)
The instrument most commonly used in the classroom setting is the soprano. Available in plastic, of course. Yamaha notes that there are 6 sizes, from sopranino down to great bass, although perhaps "down" isn't quite appropriate: the great bass is approximately the size of a human.
Although I think I can identify its presence/sound, I'll take Ginger Baker's word for it when he identifies the song where Jack Bruce plays the recorder as <Pressed Rat and Warthog>. From gingerbaker.com:
On “Pressed Rat and Wart Hog” Jack plays two basses. The second bass comes in at the end and it’s a six string. Eric’s on three times. I’m on twice with trumpet and tonette. When I played tonette, Jack played recorder.