So @OhTheWater somber/ambient/whatever...first of all like I said, nothing sounds exactly like IASW because Miles was an unparalleled genius. But what comes to mind immediately is piano trio or guitar group stuff. Bill Evans You Must Believe In Spring is probably the most actively somber jazz record I can think of, but his whole discography has at least a little of that. Waltz for Debby, surely. "The Melody at Night, With You" is another Jarrett cut. Most of the Mehldau Art of The Trio albums have that vibe heavy too. The latest Joel Ross album is vibraphone instead of piano but fits pretty well. Then for guitars you've got guys Grant Green (Idle Moments extremely this vibe), Jim Hall, Joe Pass, Wes Montgomery, Pat Metheney, Kurt Rosenwinkel or Julian Lage.. These guys tend to be pretty eclectic and not really "ambient" but definitely emotional/contemplative and frequently downtempo. Lage gets pretty "atmospheric" at times I guess. Mary Halvorson is way more avante but again, definitely reaches into that feeling. Latest Jeff Parker album pulls some ambient back into the mix. Also Bill Frisell, also very eclectic, frequently ambient, makes me cry constantly. Maybe my favorite artist lol. Seeing him twice(!!!) this weekend. See below. If you hit a dead end just listen to something random from ECM, seriously. That kinda vibe is their whole thing. Just other stuff that comes to mind, mostly more recent stuff by less known guys: Brendan eder Ensemble - Cape Cod Cottage Joe Lovano, Marilyn Crispell, Carmen Castaldi - Garden of Expression Maridalen - Maridalen Portico Quartet - Art in the Age of Automation
I have little to nothing to contribute when it comes to ambient jazz, but I will say I really like this album from a couple years back and still revisit it from time to time.
Seeing Frisell tonight, Frisell tomorrow, Kris Davis w/ Julian Lage Sunday. Ready for the Jazz Weekend
Can't remember where I heard about this project but it's very cool and out today: streaming as well but the bandcamp has a cool bio