also: シンガー・ソングライター
noun
singer-songwriter
A musician who writes and performs their own songs, typically as a solo act.
彼女は人気のシンガーソングライターだ。
She is a popular singer-songwriter.
シンガーソングライターとしてデビューした。
He debuted as a singer-songwriter.
歌手 is a general term for a singer, while シンガーソングライター specifically refers to a singer who writes their own songs.
作詞作曲家 is a more formal term for a songwriter/composer, but does not necessarily imply that the person also performs the songs.
Loanword from English 'singer-songwriter'.