Ruin, or make ridiculous, a band or solo artist's name by removing, adding or changing just one letter, e.g. Kate's Bush, Stink or Supertrump.
System of a Pwn, which if it isn't already a cover band, should be. Andrea WK? (Would definitely give it a listen) Nicki Minj Tyler, Tea Creator Queefs of the Stone Age Deep Nurple Milky Cyrus
Barenaked Baldies - stretching the rules a bit, but funny nevertheless Barenaked Laddies would be fully in keeping though, Aye Jethro Gull Pink Flood Red Zeppelin
The White Gripes All Time Plow Sage Against the Machine Mute Sister of a Down (needed to do two letters for this one) Metallic