Voice Remover is a free online tool that splits a song into two tracks: the instrumental, with the singing taken out, and the vocals on their own. Upload an MP3, WAV or M4A song, or an MP4 or MOV video; most songs are done in about half a minute. Both tracks play on the page, so you can compare them with the original before you download. Free use covers 3 full-length songs a day as MP3, with no watermark and no account.