Thelonious Monk.

 He has the reputation of one of the greatest composers of 20th century.But in the '50 he was in the shadow of the music scene.In '40 he played a great role in founding the bebop music in a night club in Harlem.He had played some jazz songs but,due to a false drugs conviction,the clubs in Manhatten were closed for him.
 Later he met a member of an independent music agency and this made him again popular.
Monk played jazz but also pop music.He composed Brilliant Corners,song that made him again a good composer.