The Lettermen are an American male pop vocal trio, known for their close-harmony pop songs. Formed in 1959, the original members were Tony Butala, Jim Pike, and Bob Engemann, with Butala remaining a constant member throughout various lineup changes. Their signature sound is characterized by lush, romantic ballads, often featuring letter-sweater-wearing members. The Lettermen's most influential works include their hit singles "When I Fall in Love" and "The Way You Look Tonight," which contributed to their enduring presence in the American music scene.