Install your phone manufacturer's USB drivers onto your computer and then connect the phone to the computer via the supplied USB cable. If your pc music library is in Windows media player, simply click the Sync button in the upper-right and then drag&drop some or all of your song library into the sync window. Click Start sync when ready, and it will all transfer automatically without further action on your part. This is the easiest way to do it, and ensures multiple songs on the same album remain grouped, and songs with cover art will have that info transfer as well.