Custom Music won't play in GMod?

Does anyone know how to put custom music into GMod?
Specifically, I’m trying to put this song in, so I can use Wire Sound Emitter to play it on a different server.
I open the Wire tab, and click the Sound Emitter option. I put in Music/sf2049.mp3 (What I named it after using Youtube to MP3 converter, and where I put it. I put it in C:\Program Files (x86)\Steam\steamapps\USERNAME\garrysmod\garrysmod\sound\music.) I create it on a wall, and wire it to Toggle with a button, I hit the button and it SHOULD play.
But, there’s just a slight spike of lag, then the song doesn’t play.

The song will play, as long as the other players have it. You can’t upload music into servers. If you are asking that you are not hearing it, then that must mean you have to upload the music into the server.

That lag spike you get is the server trying to download the sound file and failing horribly.

Response to both of you…
I played Skin On Our Teeth from L4D2 in a server that doesn’t have it, and it worked flawlessly.
I can’t hear that specific soundtrack, though. :frowning: