[SwellJoe]

Relative pitch is definitely learnable as an adult. So-called perfect pitch is the ability that has been thought to be something you're born with, or not, but more recent research indicates that kids can have it "turned on", or at least, kids can develop relative pitch that is good enough to be indistinguishable from perfect pitch, for all intents and purposes (the listener just has to refresh their pitch memory with a reference pitch now and then...maybe once a day).