also: カヴァーきょく
noun
cover song; cover version
A remake or performance of a song originally recorded by another artist. Common in music contexts.
彼女は有名な歌手のカバー曲を歌った。
She sang a cover of a famous singer's song.
このアルバムにはカバー曲が3曲入っている。
This album includes three cover songs.
リメイク is a broader term for a remake (e.g., film, game), whereas カバー曲 is specifically a musical cover.
From English 'cover' + 曲 (song). The spelling カヴァー reflects an attempt to represent the English 'v' sound more closely.