Step 1: Find the YouTube Music to Download Here we use DoTrans to put YouTube music on iPhone as it can move audio files, photos, documents from computer to iPhone, or vice versa. Go to YouTube and open the video from which you want to download music from. On the address bar of the browser, copy the YouTube URL from the search bar. Our recommendation is VideoHunter, a desktop YouTube to MP3 converter that can download YouTube music to MP3 files.