Kelly and P!nk. Both of them give me so much life during break ups. I voted kelly though, because she has multiple break up songs and they are all so relatable for me.
Adele only has break up songs! (with a few exceptions) Her 2 albums were written to get over a break up and, combined, sold about 30 million copies WW.
So far, that's all people know her for! No other option is acceptable.