Random question, sorta off topic, but not exactly...
Is "I Do Love You" the last (and perhaps only?) time that a BBs track had a single musician (not a member of the band) playing so many different instruments on one song? That person being Stevie Wonder, of course. "I Do Love You" is definitely an odd duck, and I think it may hold this record.
The only other tracks that come to mind are stuff like Love You tracks, but of course that one single musician was a BB member, Brian, playing nearly all instruments.
It's not the same as Wonder's near one-man-band, and it's a BW track, but "Let It Shine" is pretty much all Brian and Jeff Lynne, with one of the session drummers. But it's Lynne on acoustic guitar, electric guitar, bass, 6-string bass/baritone guitar, and possibly some keyboards. Then Brian on keys/piano presumably, and one of the session drummers.
According to Lynne, Brian also played glockenspiel on "LIS".