The singing artist who had a big hit with the song "Those Lazy-Hazy-Crazy Days of Summer" was Nat King Cole.

Nathaniel Adams Cole, the son of a Baptist preacher, was born in Montgomery, Alabama in March 1919. As a young child, he had formal classical piano training; he subsequently discovered a passion for jazz. He dropped out of school at 15 to pursue a career as a jazz pianist. Only later did he specialize in singing. Audiences founded that they loved Cole’s rich, husky baritone voice.

In 1936 in collaboration with his brother Eddie, he made his first professional recordings. Later, it was Cole’s rendition of Mel Torme’s “Christmas Song” that launched the solo phase of his career. Some of his major hits include “Mona Lisa”, “Unforgettable”, “L-O-V-E”, “Ramblin’ Rose”, and “Those Lazy-Hazy-Crazy Days of Summer”. In all, his hits earned him 28 gold records. He was very popular, so it comes as a surprise that he only received one Grammy nomination, in 1958, and that someone else won. In 1991, Cole had his last hit record when his daughter Natalie recorded “Unforgettable”. She mixed her rendition with his as a duet. Finally, he won a Grammy.

He did get two stars on the Hollywood Walk of Fame, one for his recording work and one for his 1956 TV show. In 2000 Cole was inducted into the Rock and Roll Hall of Fame in the Early Influences Category. Artists in that category made their mark before rock and roll became popular.

Cole died from lung cancer in February 1965.

More Info: en.wikipedia.org