The tune for Dedis “yimloch hashem” is a combination of the tunes for the song take my breath away from the movie dirty dancing and what a feeling from the movie flashdance.
MBDs shabbos song (on an old collection of yiddish songs) is the tune from the joseph song from the musical joseph and the technicolor dream coat.
Most of the popular “introductions” at todays weddings are taken note for note from popular classic rock songs.
Most of the tunes used on country yossi and the shteeble hoppers come from popular country music artists (at least CY owns up to the fact that his songs are parodies).