Possible Clues:

• For a sound on ahead, beat it
• Read about bizarre aspect of hearing
• Listened in London to singular tympanum
• I'm moved by speech a murderer turned out without one hesitant word
• It protects the tympanic cavity
• Through such sound advice, primarily, murder solved
• Read about the odd hearing aid
• It vibrates at a rock concert
• Some heard rumours — through this agency?
• A murder most foul - one picks up the vibrations