"Sometimes I'm Happy (Sometimes I'm Blue)" is a popular song.

The music was written by Vincent Youmans, the lyrics by Irving Caesar. The song was published in 1927 and introduced in the Broadway musical Hit the Deck, starring Stanley Holloway, and opened in April, 1927. The song was performed in the musical by Charles King and Louise Groody, who also made a recording for Victor Records, catalog number 20609. The best-selling versions were by King and Groody and by Roger Wolfe Kahn (with vocal by Franklyn Baur), also issued by Victor (catalog number 20599). Two other versions, a duet by Baur and Gladys Rice on Columbia Records (catalog number 998-D) and a vocal by Vaughn DeLeath on Brunswick Records (catalog number 3608) also had a significant degree of popularity.

A number of other recordings were made in 1927 (see below), but the song has become a standard, recorded by many artists since that time.

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http://en.wikipedia.org/wiki/Sometimes_I`m_Happy_
(Sometimes_I`m_Blue)