Jacques Brel was a Belgian singer-songwriter who was active in the music industry from the 1950s to the 1970s. He is considered one of the most influential and iconic figures in French-language music, and his songs have been covered by many artists. His most famous song is 'Le Moribond' (The Dying Man), which was released in 1961. Brel's music has been described as poetic, passionate, and deeply personal. He was also known for his powerful live performances.