Do rocks float?

No, but they do sail.

You're going to want to peruse the above Wikipedia link. It's genuinely very interesting stuff about sailing stones--an incredible geological phenomenon. 

Maybe I should call my band "Sailing Stones." The problem with this idea is "The Rolling Stones" is already a band name and "rolling stones" is another term (a.k.a.) for sailing stones. I think we can all agree sailing stones would be a better band name in an objective ranking.

Picking a band name is the most difficult part. It's all downhill from there.

-Frank

p.s. A disclaimer that some rocks do float on occasion, such as pumice and very small pebbles.