What are some good undiscovered artists on facebook/youtube?

Okay I know some good undiscovered(ish) artists that are on facebook and youtube like CatcingYourClouds, PleaseSayYes, and Tim Hatten...they are really good, but you know there not like huge and on the radio and stuff- like PleaseSayYes just does covers and they're really good, and CatchingYourClouds has an EP on itunes that does well, and Tim Hatten has 2 songs and also some covers. Do you know anymore artists like this? :) thank yew, (PS: i like just about anything except rap lol)