John Mayer is a singer.
John Clayton Mayer ( [ ˈmeɪ.ɚ ] born October 16 , 1977 ) is an American singer-songwriter , guitarist , and producer . In 2003 , he won the Grammy Award for Best Male Pop Vocal Performance for the single `` Your Body Is a Wonderland '' . He also won Best Male Pop Vocal Performance for `` Waiting on the World to Change '' . `` Who Says '' is the thirteenth single released by American singer-songwriter John Mayer , and the first to be released from his fourth studio album , Battle Studies .