I didn't read through the whole thread (because I'm lazy), so +1 to anything that was mentioned before.
As others have said, metal guitarists like Alex Skolnick and Marty Friedman have done jazz/jazz fusion albums.
I loved the album by Hideous Sun Demons (a jazz fusion album by guitarist Toshi Hiketa, bassist James LoMenzo, and drummer Ray Luzier).
I used to love the subgenre "acid jazz" in the '90s. It was jazz combined with funk, soul, disco. It was jazz with that extra little "pow!" that appealed to my metalhead heart. When I was in high school, a Japanese exchange student I hosted was super into acid jazz and made me a mixtape. This was the one song I couldn't stop listening to. It's jazz, it's funk, it's fusion...:
I also love the album "Be the Change" by Prasanna. He's a guitarist from southern India. That album is amazing. Hey, Victor Wooten and Alphonso Johnson both play on it. "Ragabop" is a killer song.
I remember several years ago seeing this metal band called Ever Forthright who incorporate a ton of jazz elements in their music. During their performance, it was wild seeing the lead vocalist break out a saxophone and do a saxophone solo over heavy breakdowns. It melted my brain in a good way.
The death metal band Rivers of Nihil also sometimes incorporates jazzy saxophone in its latest album: