[6] The contents of the album, plus a previously-missing track from the studio session, were also included in a 1989 limited-edition box set compilation titled Collected Solos, issued by Cadillac Distribution.

[8] Although he originally objected to the idea of doing a solo recording, he relented when he realized that it could involve a dialogue with his instrument, rather than with another "mind.

"[9] The authors of The Penguin Guide to Jazz awarded the album 4 stars, and stated that the music addresses "those moments when language cedes to silence, non-communication and sheer physicality... Parker can be heard experimenting with duration, changing the colour of sound even as pitches are sustained, but also using multiphonics to collapse the vertical organization of jazz... in favour of sounds that have mass but no single obvious direction and destination.

"[3] Writing for All About Jazz, Martin Longley commented: "Parker is intent on a relentless investigation of sustained high-pitch kettle-whistling tones, expertly manipulated into diamond hardness.

The listener is right there, on site, as these new approaches are being explored... this vintage set can be characterized as a rupturing outburst, directed with steely control.