BibTeX, citing a podcast

(Originally posted as a comment by Ben VB.)

@music{olsen,
  author={Corey Olsen},
  title={Ainulind\"ale},
  booktitle={Silmarillion Seminar},
  month=dec,
  year=2010,
  date={December 8, 2010},
  series={Podcast audio},
  url={http://www.tolkienprofessor.com/audio/silmarillion_1.mp3}
}

gets me almost there, although the letter "p" in "podcast audio" should be lowercase in note and uppercase in bibliography; this does uppercase in both.