There are two kinds of parodies - one where it's actually taking the mickey out of the song - the Billy Connolly D.I.V.O.R.C.E being a classic example, the other when you are just using the song, because people are familiar with it, and you are turning it to parody something else, not making any kind of comment on the song that is being used. The Les Barker "Nolans and Elton John" being an example of this.