I also never remember Mariah stating that "Letting Go" was a single. She simply uploaded it to Facebook for the lambs and did a little promo to give people an update on her health and the upcoming album. Typically artists release "singles" to radio and release videos to go with them. Island knows better than to under-promote in this day and age. Believe me, considering that this will probably be Mariah's last album with Island before she heads to another label promotion will be massive for this album when it officially gets finished.