On 12 April 1961, Gagarin became the first man to travel into space, launching to orbit aboard the "Vostok 3KA-3" (Vostok 1). His call sign in this flight was Kedr (Cedar; ). During his flight, Gagarin famously whistled the song ""The Motherland Hears, The Motherland Knows"" (). The first two lines of the song are: ""The Motherland hears, the Motherland knows/Where her son flies in the sky"". This song was written by Dmitri Shostakovich in 1951 (opus 86), with words by Yevgeniy Dolmatovsky.