i was wondering this myself. i know of:
immortals by clutch, put your head on my shoulder by paul anka and a different kind of love by dick walker in contracts
moonlight serendade, start all over again and they all laughed in whittleton creek
i think there used to be licensed music in hokkaido but idk
but is there more?
Walking Dead by Puressence. Plays in Contracts, at the bar during Deadly Cargo.
Ave Maria!
There’s also the hidden cutscene in Blood Money where 47 and Diana go to a karaoke bar and duet YMCA by the Village People (Note: This may be a lie)
I believe some music from WC, I think that plays on Janus’ gramophone, is copyrighted. It can also play on the “classical” playlist on freelancer and some youtubers where getting copyright claims for those pieces.