Use AIFF its faster and more clean and imports perfect into AE.
Go into itunes and go to preferences
> edit >preferences
go to general and click import settings.
Change the decoder to AIFF decoder instead of mp3 of ACC.
choose your song then right click and convert to AIFF.
DONE! 🙂
Then drag and drop into AE or import.
Hope This Helps.
Sam Healey 😀