RATM covering Minor Threat. You can’t beat the rawness of Minor Threat, but I think they did a good job.
Thrice with a really good cover of the Beatles.
Sex Pistols’ version is rough and raw!
Best cover ever the muppets take that piece of shit song and make it sound amazing
Not really a cover since only the vocalist has changed, but Joan Jett is awesome.
Shilelagh Law, an Irish bar band from here in NY, covering Dropkick Murphys with a special NY-to-Boston message. 
Shilelagh Law covering the Pogues
The first two minutes of the vid are sheer stupidity and I think Draiman sounds much better on albums than live, but I still like this one:
Rub a dub dub three men in a tub
take their song and make it YOUR OWN!
who doesn’t wanna play like a girl?
something for the guitar players to show even Hall and Oats covers can be great
best Scorpions cover ever
