You must hear "Portishead: Live AT Roseland, NYC". I think it's perfect for what your asking for.
slow, funky, groovin' laid back music
Looking for something instrumental to put on late night, quiet with deep bass and soul. Not easy or "smooth" jazz, but more hip hop influenced. I like theivery corporation, but would like to hear more afro/jazz influence. Does that make any sense? Something like People Under the Stairs or Digable Planets or Erykah Badu or Jill Scott, but without the words. Recommendations welcome. Thanks