If you want to queue a song, I presume you know what song you want. A website I like is called "www.mp3skull.com", but ofcourse there are other sites.



Once you're on the website, use the search bar on the top.



Once you've searched for a song, click the "Play" button to ensure that it's the right one.

Once you've found your song, you need the mp3 link. To do so, right click on the "Download" button (next to the "Play" button), right click it, and click "Copy link adress"

You should now have a link on your clipboard. Now launch Garry's Mod, and join the server (if you haven't done so already)

First open the ULX menu by typing "ulx menu" into the console, or by saying "!menu" in the chat.



Now that the ULX menu is open, press the Fun tab on the left, click queuesong, and at last, click the ulx queuesong.



Once the queueing menu is up, type in the name of the song you want to queue, and click next...



Then paste the mp3 URL (the one you copied earlier) by pressing CTRL + V, or right click, and then Insert, and click Finish.