I've been wondering about them for a while. Here's a list of the ones off the top of my head.
- Motorhead (Lemmy)
- The Police (Sting)
- Rush (Geddy Lee)
- Primus/Flying Frog Brigade/Sausage/Oysterhead/a billion bands that are essentially the same (Les Claypool)
- Beatles/Wings (Paul McCartney) (yeah, I consider both him and John as lead singers)