"Hello, Dolly!" is the title song of the Broadway musical Hello, Dolly!, with music and lyrics by Jerry Herman, who wrote both. The show opened on Broadway in January 1964 and is based on Thornton Wilder's play The Matchmaker, with Carol Channing creating the role of Dolly Levi. Louis Armstrong recorded the song as a single for Kapp Records in 1963, and it was released in January 1964. His version, in a Dixieland jazz style, reached No. 1 on the US Billboard Hot 100 in May 1964, ending the Beatles' run of chart-toppers, and became his most successful single. It won the Grammy for Best Male Vocal Performance, and the song won Song of the Year at the 7th Grammy Awards in 1965. Armstrong's recording was inducted into the Grammy Hall of Fame in 2001.
Other versions charted in 1964 by Kenny Ball, Frankie Vaughan, The Bachelors and Frank Sinatra. In the 1969 film adaptation directed by Gene Kelly, Barbra Streisand sang the song with Armstrong. In 1964, Lyndon B. Johnson used the tune, retitled "Hello, Lyndon!", as a campaign song.