How to make all my media player music files transfer to my iPhone?

Some titles, (from a disc) do not transfer. What are the steps?

Added (1). Mp3 format to MPEG file

Added (2). When I snyc the phone to the MP3 files, some won't transfer.

There's no such thing as a media player file. Media player is software that play different format of files. I might have been able to find out what the problem is if you had specified what the file format was and how you tried to put the file on iTunes.

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