Many musical artists have chosen to immortalize pigs in their songs. Whether speaking of the real animals or using the term to describe something else, there are many songs about "pigs". Here is a list of some of them.

Nine Inch Nails Piggy
Nine Inch Nails March of the Pig
The Beatles Piggy
Suicidal Tendencies Choking this Pig
Dave Matthews Band Pig
Sugar Ray American Pig
Eminem Chokin This Pig

There's also a band called "Porky Pig". Their website is at http://www.porky-pig.co.uk/

And then, of course, we have Porky Pig's own song, "That's all Folks!". You can download your own copy of that song here.