Molerats covered by Stoned Jesus original by Vagiant (now Fudger I think)
They did such a great job seeing the artistic promise buried under Vagiant's rather... sophomoric original take. I suppose that's a fair way to state it. I feel Vagiant/Fudger showed that their artistry is there, but it took something Stoned Jesus had to offer, be it technical ability or more musical maturity, to make this song the incredible masterpiece of a hidden track it is on their "Harvest" album.
Money for Nothing covered by Dinosaur Pile-Up original by Dire Straits
Dire Straits falls into the category of classic rock which was probably brilliant raw, but became so over-produced it lost all the soul it should have had. Dinosaur Pile-Up stripped it back down (being a three-piece will do that) and put the grit back on it. And no more campy '80s synth sounds.
Careless Whisper covered by Seether original by George Michael / Wham!
There really isn't any explanation necessary here. Seether took another "meh" pop song and turned it into a surprisingly awesome and emotional piece. Shaun Morgan is certainly king of emotive singing.
When the Levee Breaks covered by A Perfect Circle original by Led Zeppelin
I heard this version first and perhaps that's why, but I can't help but feel Zeppelin is doing it wrong when I hear their version. Everything Maynard touches seems to turn to gold though. The song is so beautifully ambient with bass and piano being the two prominent instruments over which ghostly, ephemeral vocals from Maynard are lain.
Imagine covered by A Perfect Circle original by John Lennon
John Lennon's original almost goes too far the way of stripped down. Brilliantly written piece, but I think it sounds more complete to carry its weight with A Perfect Circle's less melancholic and almost more threatening/cautionary version.