My Sacrifice by Creed is right in my range and that loooong “Agaiiiiiiiiiiiiin” sounds impressive while being easy to execute.
Angels by Robbie Williams is probably one of his easier ones.
Have You Ever Seen The Rain? By CCR is also fun and relatively easy to do.
And finally, if nobody else has done it yet, then “Wonderwall” :P
It was for the second question. I like a lot of Disturbed’s music but don’t really follow the news about the band members. Thanks for linking to the news stories. That’s disgusting and disappointing.