While most of Messiaen's compositions are religious in inspiration, at the time of writing the symphony the composer was fascinated by the myth of Tristan and Isolde, and the Turangalîla Symphony forms the central work in his trilogy of compositions concerned with the themes of romantic love and death; the other pieces are "Harawi" for piano with soprano and "Cinq rechants" for unaccompanied choir. It is considered a 20th-century masterpiece and a typical performance runs around 80 minutes in length. When asked about the meaning of the work's duration in its ten movements and the reason for the use of the ondes Martenot, Messiaen simply replied, "It's a love song."