Well the subject asks for soundtracks, NOT scores.
So, I'll say GoodFellas and Mean Streets.
If we were to pick scores: The Godfather trilogy (Nino Rota/Carmine Coppola), no doubt.
Mick
...dot com bold typeface rhetoric. You go clickety click and get your head split. 'The hell you look like on a message board Discussing whether or not the Brother is hardcore?