If you're going to give them the triosonatas, you gotta give them the good one: https://www.youtube.com/watch?v=EOTtDYTc5JY&list=PLCDB42413B...
Put on a good set of headphones and go sit in the corner.
Also obligatory: https://www.youtube.com/watch?v=Ah392lnFHxM&list=RDAh392lnFH...
The thing I appericiate most about bach is:
you can play it fast.
you can play it slow.
you can play it with an ensemble of random instruments.
you can play a single voicing all by itself.
all of it screams "musical". which, if you do play say, Tuba, or one of the larger instruments, is a godsend, as most of your lines in other pieces will bore you to death.