<http://schema.org/alternativeHeadline>
"This sign language interpretation of the hit song by Pharrell Williams will have you clapping your hands and jumping out of your seat."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/family/family-activities/blogs/pharrells-happy-is-even-happier-in-sign-language>