Stuart Nicholson wrote in the BBC Music magazine of the "Rarum" series: "... selected by the artists themselves, this series is of enormous importance in revealing the breadth of each artist's work, as much for the converted as the unconverted looking for a window into the remarkable ECM catalogue". John Abercrombie stated, "I decided to choose from my own bands over the years," guitarist Abercrombie says, "as well as ongoing collectives such as the duo with Ralph Towner, the Gateway trio with Jack DeJohnette and Dave Holland, and the Kenny Wheeler Quintet. I also was looking at this in a chronological way, as it seemed to put things in a perspective for me, tracing development in terms of performance and concept." It's been a 30-year journey packed with invention, from "Timeless" with Jan Hammer to "Cat'n'Mouse" with Mark Feldman and friends.