Pharrell Williams performs during day one of the 2015 FOLD Festival at Martha Clara Vineyards on August 4, 2015 in Riverhead, New York. Mike Pont/Getty Images

Pharrell Williams and his book publisher have launched a "Happy" campaign for young readers.
Along with Penguin Young Readers, the singer has partnered with FirstBook, a nonprofit literacy organization, to donate up to 50,000 books to children in low-income families

 More