Each letters pattern in the form of

 x.y.z
.x.y.z.
 x.y.z.
.x.y.z

is uppercased. (Number of letters in the pattern can be any number and not only 3 as in this example).

Example

bruce springsteen - born in the u.s.a.mp3    >>>   bruce springsteen - born in the U.S.A.mp3