I Tunes music files not playing on Clip

I am a new iTunes subscriber and downloaded music in mpg4 format, can I convert these files to play on Clip?  Anything I copied from CD are fine and show as mpg3 and play fine.

I suppose these files are *.m4a (mp4 audio, that’s almost the same as aac). You’ll have to convert them to mp3, wma or ogg format to play them on your device.

The imho easiest way is to use foobar2000 or dBpoweram.