Mike Theiler / Reuters Mike Theiler / Reuters This is wonderful: An unnamed Internet someone ran Mariah Carey’s “All I Want for Christmas” through a MIDI converter. Then they played the MIDI file back into an MP3. Then they posted it online. You can listen to it here. “I’m driving myself up the wall because I swear I can hear the vocal line but I don’t know how that could be if it was truly converted to MIDI,” writes Red No.