Not book covers but musical covers.  I am a big fan of genre-busting reworkings of famous songs, like Johnny Cash doing Nine Inch Nails and Depeche Mode on his American IV album.  In recent years entire albums have been produced that pick up this gimmick and run with it, verily like the wind.

Guns ’n’ Roses have been given the bossa nova treatment (see this earlier post for more details) and Richard Cheese does superbly loungey things to Tool and Snoop Dogg on his albums.  You can also catch classic tracks from the 80s and 90s redone in a jazz vibe.  By far my favourite at the moment is the rockabye baby series of CDs which feature lullaby renditions of songs by such artists as The Ramones, The Cure, Björk, and The Smashing Pumpkins.  So if you’re raising a future headbanger (or Icelandic pop princess?) you might like to check this series out.

What’s your favourite unlikely cover of a song?  If you could have any artist cover any song what weird and wonderful combination would you dream up?