Possible Clues:

• Races featuring running teams and baton passing
• Broadcasts on the subject of ballads
• Produces more eggs, perhaps, one after the other
• Passes on in multi-runner races
• Races with teams and batons
• One produces more eggs if one does them one after the other
• In them, pass it on about ballads
• Electrical devices
• How the layers come, taking over from each other
• Races for teams of four