“Hallelujah” is a song written by Canadian recording artist Leonard Cohen, originally released on his album Various Positions (1984). Achieving little initial success, the song found greater popular acclaim through a recording by John Cale, which inspired a recording by Jeff Buckley.

Cohen wrote around 80 draft verses for “Hallelujah”, with one writing session at the Royalton Hotel in New York where he was reduced to sitting on the floor in his underwear, banging his head on the floor. His original version, as recorded on his Various Positions album, contains several biblical references, most notably evoking the stories of Samson and traitorous Delilah from the Book of Judges (“she cut your hair”) as well as King David and Bathsheba (“you saw her bathing on the roof, her beauty in the moonlight overthrew you”).

Following his original 1984 studio-album version, Cohen performed the original song on his world tour in 1985, but live performances during his 1988 and 1993 tours almost invariably contained a quite different set of lyrics with only the last verse being common to the two versions. Numerous singers mix lyrics from both versions, and occasionally make direct lyric changes, such as Rufus Wainwright, a Canadian-American singer, substituting “holy dark” and Allison Crowe, a Canadian singer-songwriter, substituting “Holy Ghost” for Cohen’s “holy dove”.

Cohen’s lyrical poetry and his view that “many different hallelujahs exist” is reflected in wide-ranging covers with very different intents or tones, allowing the song to be “melancholic, fragile, uplifting joyous” depending on the performer.
(source: Wikipedia)