Sunny Murray had a rather positive opinion of the date in is Paris Transatlantic interview with Dan Warburton:
Talking of lost albums, whatever happened to your album for Columbia [“Spiritual Infinity”, from 1968, featuring Clifford Thornton, Arthur Jones, Dave Burrell, Alan Silva, Juni Booth, Frank Wright and Art Lewis and “possibly others”]?
That was a great record, but they never put it out. Great orchestration. Matter of fact Frank Wright's first record [third in fact, after the two Wright ESP albums from 1965 and 1967 respectively]. He was in a group with fourteen of the baddest cats in New York, and he played wonderfully to be one of the newest, not being a real academic musician, you know. For that record I did some crazy stuff – I wrote some very nice music for that record. One of the compositions was like an experimental piece, like a John Cage piece – I had a lot of different sound things, and I had a siren. I didn't want the band to know it... I wanted to see their reaction... The band was playing their ass off and I started to work the siren real low rrrrrrrrrr so that only I could hear it. (That's another thing in Helmholtz, playing above and below the audible level... That's why moms and grandmoms say what kids play today is loud, because they're used to listening to the radio at a lower level, and kids today above it...) So I started working the siren, and I raised it rrrrrrrrrr to their level, and when I got to their level – it was a great experience – the whole band heard it together and didn't know what the fuck it was! I was behind them at my drums watching their reaction, and they got hot, their hearts beat faster, I was really messing with 'em RRRRRRRRRR and then THE BAND STOPPED. Nobody could get their breath to challenge this sound... but Frank Wright continued! (Laughs) He continued, I raised it higher, he continued, I raised it higher and finally he stopped, he couldn't continue no more! He says “MURRAY WHAT THE HELL IS THAT MAN?!” I told everybody, it's a siren!