Question: Lost Cause is a song by an artist mostly known for what?
Context: The Lost Cause of the Confederacy, or simply Lost Cause, is a literary and intellectual movement that describes the Confederate cause as a heroic one against great odds despite its defeat.  The beliefs endorse the virtues of the antebellum South, viewing the American Civil War as an honorable struggle for the Southern way of life, while minimizing or denying the central role of slavery.  While it was not taught in the North, aspects of it did win acceptance there and helped the process of reunifying American whites. Leopoldo Flores (1934 – April 3, 2016) was a Mexican artist mostly known for his murals and other monumental works which are concentrated in the city of Toluca, State of Mexico.  He was born into a poor family in rural State of Mexico, but his artistic ability was evident early and he was able to attend the Escuela Nacional de Pintura, Escultura y Grabado "La Esmeralda" and receive a scholarship to study in Paris.  His best known works are the Cosmovitral a large work in stained glass and the Aratmósfera, a “land art” piece both located in Toluca.  The first is used as a symbol for the State of Mexico and the latter dominates the main stadium and the hill behind it at the main campus of the Universidad Autónoma del Estado de México (UAEM).  He has received a number of recognitions of his work from the State of Mexico and an honorary doctorate from the UAEM, which also founded the Museo Universitario Leopoldo Flores to house and promote his work.  Despite advanced Parkinson's disease until his death in 2016 Flores was still an active artist. Brielle Davis (born 1984 in Sydney, Australia) is an Australian recording artist mostly known for her song "Serial Thriller" which received good publicity during 2006. Ayanda Mabulu (born in 1981) is a South African artist mostly known for his paintings. Yury Pavlovich Annenkov (Russian: Юрий Павлович Анненков also known as Georges Annenkov); 23 July [O.S. 11 July 1889] 1889 in Petropavlovsk, Akmolinsk Oblast, Russian Empire – 12 July 1974 in Paris, France), was a Russian artist mostly known for his book illustrations and portraits.  He also worked for theatre and cinema (design).  A member of Mir Iskusstva. "Lost Cause" is the fifth song by Beck from his fifth major-label studio album, "Sea Change".  It was released as a promo single. Canadian rapper Tory Lanez has released one studio album, one extended play, seventeen mixtapes, thirty-three singles (including twelve as a featured artist) and twenty-five music videos.  In 2009, Tory Lanez began his career by releasing his debut mixtape, "T.L 2 T.O".  He received major recognition from the mixtape, "Conflicts of My Soul: The 416 Story" released in August 2013, which included guest appearances from Roscoe Dash and Kirko Bangz.  In 2014, he released "Lost Cause" which led to his first tour the "Lost Cause" tour.  Tory Lanez collaborated with the WeDidIt collective on the "Cruel Intentions" EP in 2015. " Chixtape III" and "The New Toronto" were released later that year.  He released his debut album "I Told You", in 2016. Carlos Perot (1919-2003) was the pseudonym of Carlos Pelikan Rotter, a Chilean artist mostly known for his paintings depicting marine landscapes and scenes.  He was, at the time of his death, the only Latin American recognized by the Royal Society of Marine Artists. Leonardo Nierman (born November 1, 1932), full name Leonardo Nierman Mendelejis, is a Mexican artist mostly known for his painting and sculpture.  He at first wanted to be a violinist, but gave it up after twenty years when he compared a recording of his playing with that of Yehudi Menuhin.  However, his musical training has been a major influence on his painting and sculpture, reproducing movement and harmony as Nierman sees similarities between the two disciplines.  Nierman has had exhibitions in Mexico and abroad and over sixty recognitions of his work, half of which are from outside of Mexico.  His work is abstract but still with discernible images from nature such as birds, water, lightning and more.  His paintings are in pure colors while his sculptures are generally of metal, often silver-toned. Beck Hansen (born Bek David Campbell; July 8, 1970), known mononymously as Beck, is an American singer, songwriter, record producer, and multi-instrumentalist.  He is mostly known for his musical composition, as well as a palette of sonic genres.
Answer: his musical composition