If you want to add a song to your Final Cut video, you need to save it in the correct format.
If you are working on a Mac the song should be saved as an AIFF file.
If you are working on a PC the song should be saved as a WAVE file.
Converting you file.
1 Determine the audio sample rate of of your Final Cut sequence by selecting the sequence in the Browser and then choosing Edit > Item Properties.
The audio sample rate appears in the Item Properties window. The default DV preset uses 48 kHz audio. Make a note of the sample rate.
2 Open the song in Quicktime.
3 File > Export.
Choose where you want the file to be saved. This is where the AIFF or WAVE will be saved.
4 Choose Sound to AIFF from the Export pop-up menu.
Click the Options button.
In the sound settings window, set the Compressor to None and the Rate to the sample rate of your sequence. Also choose Stereo unless this is a mono audio file.
Click OK to dismiss the Sound Settings window.
Click the Save button.
5 Import the AIFF or WAVE into your Final Cut project as you would with any other media file. You can drag the file direct from the Finder into the Browser window or choose File > Import > Files