Blood Sweat & Tears, Chicago, Tower of Power, Ten Wheel Drive, etc.
True. There've been many groups that used horns, but, the numbers and opportunities pale in comparison to the groups that don't, and the number has steadily decreased over the years. This phenom has carried over to commercials and promos where synthesizers are used to get horn[and strings(violins, etc.)] "sounds." Editing and overdubbing techniques are used to fill out horn sections, whereas one or two players record and overdub several parts. Generally speaking the mindset has been taken away from the player/artist and been replaced by another kind of art/artist, the editor. Computer editing programs in the hands of a somewhat musically savvy editor can make bad and mediocre players sound really good.
re: genius
I don't consider Hendrix, et al, genius(tho he might have been). I think the more appropriate/correct term would be ingenuity.
also: Funny how in some quarters a guy that's merely an adequate player is considered a virtuoso.