▁there ▁was ▁no ▁doubt ." ▁ ▁In ▁a ▁ 2 0 1 5 ▁interview ▁for ▁Song writing ▁Magazine , ▁Par s ons ▁re called : ▁ ▁A ▁sa x oph one ▁solo ▁was ▁originally ▁planned ▁for ▁the ▁song ' s ▁instrument al ▁break . ▁However , ▁after ▁hearing ▁Har ley ' s ▁idea ▁for ▁the ▁solo , ▁guitar ist ▁Jim ▁C reg an ▁began ▁to ▁play ▁the ▁idea ▁on ▁the ▁guitar . ▁Har ley ▁re called ▁in ▁ 2 0 1 4 : ▁ ▁A ▁number ▁of ▁backing ▁sing ers ▁contributed ▁to ▁the ▁song , ▁including ▁future ▁chart - to pper ▁T ina ▁Charles , ▁as ▁well ▁as ▁Y v onne ▁K ee ley , ▁L inda ▁Lewis ▁and ▁L iza ▁St rike . ▁ ▁When ▁the ▁song ▁was ▁near ▁completion , ▁Har ley ▁played ▁an ▁early ▁mix ▁of ▁the ▁song ▁to ▁Bob ▁Mer cer , ▁who ▁was ▁the ▁head ▁of ▁A & R ▁at ▁E MI . ▁Mer cer ▁was ▁so ▁blow n ▁away ▁by ▁what ▁he ▁heard ▁that ▁he ▁immediately ▁pron ounced ▁the ▁song ▁as ▁a ▁number - one ▁hit . ▁Har ley ▁remembered : ▁" We ▁were ▁all ▁drink ing ▁Mart ini , ▁it ▁was ▁late ▁at ▁night , ▁and ▁we ▁were ▁completely ▁kn ack ered . ▁Bob ▁came ▁in ▁and ▁was ▁absolutely ▁blow n ▁away . ▁I ▁asked ▁him ▁what ▁he ▁thought ▁and ▁he ▁said ▁simply , ▁" Number ▁one ". ▁ ▁By ▁the ▁time ▁the ▁song ▁was ▁finished , ▁Har ley ▁and ▁the ▁band ▁felt ▁confident ▁the ▁song