 The song , which is written in the key of E @-@ flat major , features an organ and piano sound . The song starts with a hushed electric organ ballad , including Martin 's falsetto . The song then builds with both acoustic guitar and piano . The sound then shifts with a plaintive three @-@ note guitar line , ringing through a rhythmic upbeat tempo . Subtle instrumentation includes the background sound of church @-@ style organ <unk> piano notes , acoustic and electric guitar riffs , drums , and a singalong chorus . 
