Thank you for the insight Bloodbane!
4. Do you have any interest in getting the individual instrument tracks for a song? (These are also known as Stems & are used in dynamic audio engines. Allowing you to personally fade in & out drums, synthesizers & orchestral instruments at your desire to suit the scene.)
I don't know what to use those so no.
If you're interested in learning about two popular ones Wwise & FMOD are sound engines that allow for you to have more control of Audio. Makes it easy to set points in a level where music starts & stops. It also allows for you to work with a composer or find sound packs with Stems to individually bring the drums in when an enemy appears or other instruments. Worth checking out if that sounds remotely interesting.