http://musicfeeds.com.au/news/disturbed-frontman-david-draiman-lends-a-hand-to-megadeths-new-album/

http://www.ultimate-guitar.com/news/upcoming_releases/david_draiman_confirmed_as_guest_singer_on_the_new_megadeth_album.html

http://www.blabbermouth.net/news.aspx?mode=Article&newsitemID=188178

His songs are "Forget To Remember" and "Dance In The Rain."

He is not featured on vocals. He gave Mustaine some lyrical and melodic suggestions. No singing for David.

Alright, I'll change it.

Now, Mustaine is saying that Draiman did actually sing.