(Progressive/Jazz-Rock) Nucleus - Elastic Rock (1970)/We'll Talk About It Later (1971) - 1994 (2CD), APE (image+.cue) lossless

If SOFT MACHINE was a rock group that veered towards jazz rock, NUCLEUS can be seen as a jazz group that veered towards jazz rock, as most musicians were clearly jazz musicians with the notable exception of Chris Spedding (yes, Mr. motocycle-punk/Chameleon-man of rock). If a comparison of those two groups can be made, it is also obvious that NUCLEUS became a nursing ground for those musicians before joining SOFT MACHINE (around ten musicians did the transfer). They were signed on the famous progressive Vertigo label and the first two superb artwork album sleeves were designed by Roger Dean.

NUCLEUS was trumpet player (and confirmed jazzmen and biographist) Ian Carr's project and the its discography is rather confusing with the different designations as some were called "Ian Carr's Nucleus", "Nucleus With Ian Carr" or simply "Ian Carr" (but with all NUCLEUS members playing). This is hardly meaning that he was the main writer, main influence or main soloist. Many outstanding musicians contributed loads of material among which Karl Jenkins, Jeff Clyne, Chris Spedding, Alan Holdsworth, Brian Smith & Dave MacRae. Their music was of a frantic instrumental jazz-rock much alike some Miles Davis jazz-rock of the same era. Loads of wind instruments, but KB and a wide place for the guitarist (Spedding's guitar is superb and grandiose while self-restrained). Clearly the groundbreaking essence of NUCLEUS is best heard on the early albums as the later albums only managed to repeat the formula but not evolving much.
Progarchives Biography

Ian Carr (trumpet, flugelhorn)
Karl Jenkins (baritone sax, oboe, piano, hohner electra piano)
Brian Smith (tenor & soprano saxes, flute)
Chris Spedding (guitar)
Jeff Clyne (bass)
John Marshall (drums, percussion)