I've included 4 music tracks in this set, made by me,
along with the sourcemod plugin I've edited to suit these situations.

You can preview the music in my soundcloud account here:

Counter-Strike: Source music pack playlist

As for the plugin, I've edited the original RoundSound plugin for CS:GO by ANTiCHRiST and TumTum.

You'll need to download and install Metamod: Source and SourceMOD, before downloading
this however - if you want the music to work properly.

Note that this is a server-side package - it will only work on YOUR server, since it's a SourceMOD plugin.
You won't be able to hear the music on other servers which don't run the package.

It's possible to convert the music to vanilla sound, but the files would have to be in .wav format
and you'll have to put them in your custom folder with according structure in sound/radio, rename 
the files to replace the original ctwin.wav, terwin.wav and bombpl.wav.

I don't recommend that, since the plugin is set to play both bomb plant tracks separately for the T team and the CT team.

If you like what I've done here, leave an endorsement and stay tuned for more music added to this pack.

I'll keep updating this pack and maybe add some new sounds too.