I rip some songs from my cd collections recently, n transfer it to my phone and try to play it.
Its failed!...whew!...then i relaized that the songs format is mp4a..
I stumble upon this web, while browsing for audio converter...it called NCH software.
It allow u to convert any kind of formats...very simple unlike previous program i been used.
Available for windows and MAC, n of course its free! :D
enjoy your music!