Explained: Tony Butala, co-founder of Lettermen vocal group known for 'The Way You Look Tonight,' dies at 87

Tony Butala, co-founder of The Lettermen, died Sunday at age 87

Grammy nomination

Recognition by the Recording Academy for excellence in the music industry

Billboard Hot 100

A chart ranking the most popular songs in the U.S.

Hollywood Walk of Fame

A series of sidewalk stars honoring entertainment industry figures in Los Angeles

Mitchell Boys Choir

A Los Angeles-based boys' choir that performed in films during the mid-20th century