A "transcription" that always makes me grin is "Jesu, Joy of Man's
Desiring" played on the banjo and then sung by Pete Seeger.

It lasts one minute.

His 'Goofing-Off Suite' is out on a Smithsonian Folkways CD (it was
originally recorded in 1955), and includes the Duet from Beethoven's Sym
7 & the Chorale from Beethoven's Sym 9.

"Lambarena" is a mix of Bach's music and music from Africa.  It's been
used for ballets.

The group Sotto Voce plays "Contrapunctus IX" on two tubas and 2 euphonium
on their 'Consequences' CD.

Earl Wild, Samuel Feinberg, Ferroccio Busoni, John Bullard (banjoist)
and John Patykula (guitarist), James Kline (11 string arch guitarist),
Leigh H.  Stevens (marimbaist), The Amherst Saxophone Quartet, Pittsburgh
Symphony Brass -- these are but a few of the artists I have and enjoy
doing their bearbeitung.

Ain't Bach grand?

Susan