I thought about doing musical instrument tuning for that reason.
   Pipe organs, pianos, whatever. Then I saw all the travelling.
   meh.

   What helps me with out of tune-ness in listening, is I consider
   the 'beats' inbetween the out-of-tune notes to be another song
   in itself, created inadvertently, as if the song is parent
   giving birth to kids that go off and do something contrary to
   the parents.