That's quite a broad question.
You can import mp3s into Director or keep them in a separate
or provide a browse dialog so the user can select a file to
Either way you need to provide the user with the ability to
file and then play it.
Playing is as simple as linking to an external file or fully
it and then using the
To let the user choose a file you could create a text member
member names (or files found) on individual lines and the
play the file
named when the user clicks on a line. Check the docs for
textSprite.pointToLine() and _mouse.clickLoc
Also, search the forums as this is a frequently asked