Harley-Davidson motorcycles are known for the characteristic "potato-potato-potato" sound of their engines. But what gives them that classic sound?

Harley-Davidson once filed a sound trademark application in hopes of enshrining its ownership of the unmistakable exhaust sound into law.

Harley-Davidson has a wide offering of audio systems for the motorcycles it makes, from saddlebag and fairing speakers to on-ear pieces ...