: Buyers should be aware that the original stage vocal score may not include movie-only hits like "Hopelessly Devoted to You" or the Frankie Valli title track "Grease" unless it is a specific "Film" or "Revival" edition [11, 16].
: The piano arrangements are designed to reflect the original "Grease" tracks without merely doubling the vocal melody, providing a rich, professional backing for the singer [6].