The song which was Sammy Davis, Jr. biggest hit song was 'The Candy Man' (1971). This is a song that reached the top of the Billboard Hot 100 in June 1972.

'The Candy Man' (aka 'The Candy Man Can') is a song that originally appeared in the 1971 big motion picture "Willy Wonka & the Chocolate Factory". It was written by Leslie Bricusse and Anthony Newley specifically for the film.

Although the original book by Roald Dahl ('Charlie and the Chocolate Factory') contains lyrics adapted for other songs in the film, the lyrics to 'The Candy Man' do not appear in the book. The film's soundtrack version of the song was sung by Aubrey Woods. He is the guy who plays Bill the candy store owner in the film.

More Info: en.wikipedia.org