Battle Studies World Tour was a tour by a singer-songwriter born in 1934.
Battle Studies World Tour was a worldwide tour by American singer John Mayer .	John Mayer	John Mayer	Battle Studies	Battle Studies (album)
John Clayton Mayer -LRB- -LSB- me. -RSB- born October 16 , 1977 -RRB- is an American singer-songwriter , guitarist , and producer .
