LeonardCohen.
According to the QQ Music APP query, the original singer of "Sing Hallelujah" was Leonard Cohen. "Hallelujah" is a song written by Leonard Cohen, a famous Canadian troubadour and folk singer, in 1985. , included in his album "VariousPositions". Excerpt from the lyrics: "Iraiseahallelujah, Heavencomestofightforme."