I copied MP3 file to Iphone but Music app does not see it

I am not everyday user of iphone. So I connected iphone 4 with ios 7 to my Ubuntu 14.04 machine, Nautilus opened and I copied mp3 files so Downloads folder.

Then I disconnected the phone and opened Music app, but it was empty.

Where should I copy mp3 files so Music can see them?

Can Music app see WAV files as well?