It’s always fascinating to discover what a member of a well known group is getting up to under their own name.

September allows one such opportunity with the latest album from bassist Stephan Crump (of the Vijay Iyer trio), a new quartet project called Rhombal featuring saxist Ellery Eskelin, trumpeter Adam O’Farrill, and drummer Tyshawn Sorey.

It’s very open, loose music with shifting tonalities and a nice tension between harmonic dissonance and steadily unspooling groove.

Crump has a bag full of ideas as a writer and reminds me of early much more avant garde Dave Holland records, say when Holland was with Anthony Braxton, the same sense of full tone and deft, cerebral, development always present in Crump’s playing.

Listen to some of what’s in store above, and more on Crump here