Possible Clues:

• Sound container put in order of rank
• Container to go into tape deck
• Tape deck insert
• If you've got it taped, that's the way it comes
• It may contain film of Nutcracker, eliminating noise
• Class holding collection for sound equipment
• Whatever's in it, you'll have it taped
• Container that holds a magnetic tape
• On deck you've got it taped
• Container for a magnetic tape