lastlegacy.us

The option to add a music from the internet, by simply copy and paste a Youtube link or something into a text box. The song will load and then play when the player starts the level.

I don't really know if there's any way to do it, else, do it because it would be really useful. You could put the alternate music in the level itself instead of putting the link in the topic.

You can use HTML in a sign to make a link to the music, which will open in a new tab, if you're in a browser. For some reason this doesn't work in the standalone version though.

Custom music: likely
Internet music: unlikely
Youtube music: very unlikely