Depending on how it's done, this could be good or bad:
In NFS 2015, the Legends Update added music from previous games.
Some tracks actually fit the game / situation they were played in really well, mostly the garage music that was added. There was one track (Saki Kaskas - Callista) that I didn't even know was an old track until I looked it up, it just fit the garage so well!
However, during races in Eddie's Challenge, there were some tracks that just didn't fit the racing. As much as I like Rock - I Am Rock, I had this creeping sense of dissatisfaction hearing what was a menu-only song now only playing during races. There was a reason it was limited to the menus by default in MW2005...