noun
standard number
A well-known, classic, or frequently performed piece in music, theater, or similar repertoire. Often used for jazz standards, pop classics, or staple show tunes.
彼女はライブでジャズのスタンダードナンバーを何曲か歌った。
She sang several jazz standard numbers at the live show.
この曲はミュージカルのスタンダードナンバーとして世界
This song is loved around the world as a standard number from the musical.