Scorsese said that he's been criticized for using so much rock n roll in his soundtracks, because wiseguys never listened to it. I'm glad Marty did use the rock music though because it made his movies timeless. For an example of how music could ruin a movie with potential, see Joe Cortese's "The Death Collector", aka, "The Family Enforcer", aka "The Collector", aka "The Enforcer" (Pesci and Vincent's debut). The disco. Ugh. Makes it impossible to watch.

Here's the Neapolitan song that played throughout Mean Streets.

https://www.youtube.com/watch?v=--mdYj3A7JI