Barry Schrader, a music professor and composer at the California Institute of the Arts (I TOLD you, for short it's "CalArts" NOT "CIA" please) volunteers at a pot-bellied pig rescue center called, er, Little Orphan Hammies. As I noted in December in the sampled-pigs-christmas album post, there was a brief fad in the '90s where it was thought by some that baby pigs would make fun pets. Then those cute little guys turned into monsters weighing hundred of pounds, and were not wanted any more.
Duke, an especially musical pig, can be briefly seen here playing a xylophone with a mallet held in his mouth:
This Los Angeles radio piece explains more, and features Duke's performing, as well as Schrader talking about his own recording made entirely from the melodic material of Duke's performance. Which you can hear here:
Barry Schrader: "Duke's Tune"
It's nice music, no offense Mr. Schrader, but I'd really like to hear/see more of Duke.