where are my mp3's?

[freaKs]

i connected my htc to my lappy, then copy and pasted all the mp3 files i wanted on my phone. When connecting i seen the fothe root folder which is where i pasted my mp3 files. When trying to access them on my htc, I found out that I could not find them at all on my phone.

So, myquestion is, where the heck are my mp3's at? and how do i add them to the liabrary just the same way as if i purchased them from the sprint music store? Thank you in advance