His "Captain Fantastic and the Brown Dirt Cowboy" was the first album to debut at #1 on Billboard (5,4)

I believe the answer is:

elton john

(Other definitions for elton john that I've seen before include "Flamboyant singer and pianist" , "Your Song singer" , "Singer/pianist/composer" , "English composer, singer and pianist, born 1947 and named Reginald Dwight" .)

I've seen this clue in The New York Times.

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