I use Mp3 converter to put my music in . (INSTRUCTIONS) Go to google and type Youtube mp3 downloader. Click the first link. Then open the video you want in a new tab. Highlight the link of the video. Right click once highlighted copy the link and paste it into youtube mp3 downloader bar that's there.Then convert the video and click download.Once its downloaded put it in what ever file you want. Go to scratch then go to the sounds tab then import the music you want. Then go to scripts click events and place a when clicked green flag symbol into the area. Lastly go to sounds and place a play sound block onto the area. Last of all click on the play sound blocks sound that it has and change it to your music. After that connect the when clicked green flag symbol onto your sound block and there you go. Have fun :) Check out Catch That Spartan! remix I made