Remember the scene in Wayne's World where the guys go to a guitar store and the sign on the wall says NO STAIRWAY TO HEAVEN? That's because covering Robert Plant is usually a terrible idea. The only time I've seen it pulled off successfully happened a few years ago, when I had the privilege of seeing kHz's Raiana sing "Black Dog" and "Rock and Roll" at the Viper Room in LA, with Dave Navarro standing in on guitar. I also recall that Sheryl Crow does a decent cover of the latter song, though not as well as Raiana--she blew the roof off.
I was in a store yesterday, and heard a cover song that made me cringe. Singers, to lessen the chance of that I throw up in my own mouth in the future, please please please do NOT cover Van Morrison. Unless, of course, you're Robert Plant.
Thank you.