Go inside this surgeon simulator project (click the "see inside" button). Then go to the sprite "Music" and put the music you want in your backpack (in scratch). Then you can use that sound wherever you go (in scratch).
Big thanks to this website: https://blackheron.bandcamp.com/album/surgeon-simulator-2013-ost - for giving me the soundtrack. (Btw, you need to pay for it, and it costs 3.13 dollars, but you can only pay in pounds, but it accepts dollars as well.)
