Finding downloaded server music/SFX

Is there anyway, by looking inside the game files, to find the downloaded (or references to) SFX and/or music from a certain server or it’s loading screen?

loading screen? Not really, the server has two options to play a custom music file, a mp3 or wav downloaded and then your client is told to play it, or they use the new sound libary that lets you stream ogg files. If it is the first check your sounds folder and your downloads/sounds folder.