Gamasutra has an interesting article about music in F:NV. It's a really interesting read, check it out <blockquote>The music from the previous games acts as an homage to the lineage of the series. For example, most of Mark Morgan's music can be heard in the Vaults scattered around the wasteland, and the Fallout 3 tracks are mostly used in areas where there are references to military technology and the Brotherhood of Steel.
However, the vast majority of the music in the game was composed for New Vegas and it takes the series in a new direction.</blockquote>
However, the vast majority of the music in the game was composed for New Vegas and it takes the series in a new direction.</blockquote>