Okay, I'll get the ball rolling.
This is Richie Castellano doing a cover of Queen's Bohemian Rhapsody. Richie is the current Bass Player for Blue Oyster Cult, which is odd, considering they had their biggest hits in 1976 and 1981 and he wasn't even born until 1980!
What makes this video amazing, besides the fact that it sounds so much like the original, is that Richie played every single instrument and did all of the vocals himself! What an incredible talent. To get the full effect, <right click> on the image and select <watch on YouTube>.