Obviously, this (which I have heard called "The Internet's Favorite Song" on more than one occasion) is the song to which I alluded in the post title; so, it's not particularly off topic. I suspect that, going forward, the Weezer/Yankovic cover will be considered the second most definitive version after Toto's original recording.
My personal favorite cover is a toss-up between this one by a Harvard University percussion club
and this one by Irish secondary school students.
RE: Follow the Melody #2: That Other 80s Song about Africa (or The Kony 2012 of 1984)