Some tracks from 1 and 2 are in New Vegas at some points. Like Acolyte's of the New God from the Master's Cathedral in FO1. A nice callback at times
Yeah but a lot of songs aren't in there... Or at least I never heard them. For ex. The car's overworld track from fo2. Where's that at in the game?
You can find the Chosen One's highwayman outside of Novac, and the theme plays when you come across it.