Rearranging the letters of 'I Have a Dream' (ABBA song & Martin Luther King, Jr.'s speech) gives:
I'm a rave head.
(by Trond Valen using Anagram Genius) (2007) (pending approval)
Aver head aim.
(by Dan Fortier using Anagram Genius) (2007) (pending approval)
A heavier, mad.
(by Chris by hand) (2006) (pending approval)
Other related anagrams without their own page:
"Martin Luther King's "And I have a dream"" -> "Ah! add, "like having trams run near time."" (by Jim Colles by hand) (2004)
"Benny, Bjorn, Agnetha and Frieda - ABBA" -> "Joy! A bab frighten and Banana bender." (by Chris by hand) (2006) (pending approval)
"The late, great Dr. Martin Luther King" -> "Think tall! A dreamer greeting truth." (by O.V. Michaelsen (Ove Ofteness) by hand) (1989) (pending approval)
"Martin Luther King, Junior" -> "Mini truth learing - or junk?" (by Kevin Sheldrick by hand) (2014) (pending approval)
"Dancing Queen" -> "EQ and nice gun." (by Chris by hand) (2006) (pending approval)