moving my own music from my pc to my Nexus 4

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http://forums.androidcentral.com – I have 1000+ songs that are from my own albums that I want to move to my Nexus 4. I synced them with media player but it downloaded all of them plus 4000 pictures. could not view them on my phone, and the phone could not find them. When I use usb cable connected back to my pc I can find them and play them. was advised to download a file manager so i could at least see them and deleted them all as well as the pictures. Now trying to find a simple solution to change the file extensions on my music so I can transfer them to the phone and it can play them. any help? I don't want to give my c/c inf (HowTos)