Hello. I recently imported a map that I made in the Puzzle Maker into Hammer. I've successfully made all of the adjustments to my map that I needed...except for changing the music. After combing my way through the entire map, checking the outputs on every trigger I could find, I finally found the trigger that turns the music on. The problem is that I can't seem to find the entity that it's targeting, "@music". It isn't anywhere on the map! I need to find the "@music" entity so that I can change the background music, but it's nowhere to be found. Am I doing something wrong? Does the "@" symbol in front of it mean anything? Thanks in advance for the help.

It likely means that it is in an instance. You should be able to find it using the Map > Entity Report option in the menu bar... look in the second column in the (parenthesis) for the name. When you find it select it and select GoTo... do what you need to do, but save the instance as something else and use your modified instance instead of the default one.

What they said.

Quick search: it is the the global_ents instance and is an ambient_generic.

It is inside of the global_ents instance, which is inside of the entry elevator instance. Delete the said output, add a new ambient_generic with the play everywhere flag ticked and the is NOT looped flag unticked, then choose the background music you'd like and play it from the same trigger.

if I recall correctly it is in the mandatory observation room, the one with the projected texture

in the future you can just collapse all instances... then make a point entity name it what you want to find.. in this case @music
then hit the mark button, and it will select all the entities with that name