I am pretty sure that they are sticking to traditional Ink spots sons along with Kay Kyser, Bing Crosby, And Billie Holiday songs so that might narrow down the probability rate of songs, assuming im right of course
Actually that's more like Fallout 3 here's what's probably gonna be in New Vegas
Dean Martin, Frank Sinatra, Gene Autry, Marty Robbins, (HOPEFULLY) Elvis,
Basically anything old western or Vegas rat pack/big band swing stuff.