First recorded by Cliff Edwards (1940).
Hit versions by Glenn Miller & His Orchestra (US #1 1940), Guy Lombardo & His Royal Canadians (US #4 1940), Dion & the Belmonts (US #30 1960), Linda Ronstadt (MOR #32 1986).
From the wiki: “‘When You Wish Upon a Star’ was written by Leigh Harline and Ned Washington for Walt Disney’s 1940 animated adaptation of Pinocchio. The song won the 1940 Academy Award for Best Original Song, and was also the first Disney song to win an Oscar. It has since become the representative song of The Walt Disney Company (e.g., the ships of the Disney Cruise Line use the first seven notes of the song’s melody as their horn signals). The original version was sung by Cliff Edwards in the character of Jiminy Cricket, and is heard over the opening credits and in the final scene of Pinocchio. Edwards recorded another version in 1940 for an American Decca Records ‘cover version’ of the score of Pinocchio, conducted by Victor Young and featuring soprano Julietta Novis and The King’s Men.”