, ▁they ▁rejected ▁it , ▁stating ▁that ▁they ▁wanted ▁something ▁more ▁commercial . ▁Moore ▁obliged ▁and ▁asked ▁his ▁American ▁friend , ▁Peter ▁B leg v ad ▁to ▁come ▁to ▁Hamburg ▁and ▁help ▁him ▁write ▁some ▁pop ▁songs . ▁B leg v ad ▁rec alls ▁respond ing , ▁" Pop ▁songs . ▁Three - ch ord ▁stuff . ▁How ▁hard ▁can ▁that ▁be ▁... ?" ▁For ▁them ▁it ▁was ▁a ▁jo ke . ▁They ▁said , ▁" we ' ll ▁take ▁the ▁p iss ▁out ▁of ▁pop ." ▁▁ ▁Call ing ▁themselves ▁S la pp ▁Happy , ▁Moore ▁and ▁B leg v ad ▁wrote ▁the ▁song ▁" Just ▁a ▁Con vers ation " ▁in ▁ 2 0 ▁minutes . ▁They ▁recorded ▁it ▁in ▁Fa ust ' s ▁studio ▁with ▁Fa ust ' s ▁rh ythm ▁section ▁backing ▁them . ▁But ▁when ▁the ▁pair ▁found ▁their ▁singing ▁was ▁not ▁working , ▁they ▁asked ▁Moore ' s ▁girl friend ▁( and ▁future ▁wife ), ▁D ag mar ▁Kra use ▁to ▁sing . ▁She ▁had ▁s ung ▁previously ▁on ▁stage ▁and ▁in ▁several ▁groups , ▁but ▁wanted ▁to ▁stop . ▁Rel uct antly , ▁however , ▁she ▁agreed ▁to ▁sing , ▁and ▁transformed ▁S la pp ▁Happy ▁from ▁a ▁jo ke ▁into ▁something ▁unexpected . ▁American ▁music ▁academic ▁Benjamin ▁P iek ut ▁said ▁" K ra use ' s ▁voice ▁possessed ▁a ▁lev ity ▁and ▁grace ▁that ▁was ▁shot ▁through ▁with ▁world - we ary ▁L eny iana ." ▁Now ▁a ▁tri o , ▁S la pp