Probably the various combos Miles Davis was playing with between 1945 and 1965. If I have to pick one of them, the Nonet that recorded most of the tracks on
Birth of the Cool.
Close second would be a tie between:
Weather Report before Jaco died; and
Whatever band Dexter Gordon was playing with.
Honorable mentions:
Creedence Clearwater Revival
Rich Mullins and the Ragamuffin Band
The Moody Blues.
Chicago Transit Authority/Chicago.
Emerson, Lake, and Palmer. (don't mind the vocals).
Chet Baker (when he sang)
Eric Burdon and the Animals (though really is just because of one incredible song)
Parliament
Grandmaster Flash and the Furious Five (again primarily due to one incredible song)
Pink Floyd
Guilty pleasure: Bee Gees (especially the early stuff, but I admit to liking most of the disco era stuff, too, except for Sat Night Fever album)
And do not be conformed to this world, but be transformed by the renewing of your mind, that you may prove what is that good and acceptable and perfect will of God.
Romans 12:2 (NKJV)