What is the name of this song!?

ok so ther is this song ive been hearing on the radio so i think its new and the chorus is "dada da da dada da DADA DA DA dada da" and somwhere in the song he sings somthing like this "mocking bird in the tree" its upbeat and the guitar has the same rythm as the chorus and its popish rock (its not chelsea dagger) please help me out i want this song!!