The girl duo "Smile" (Smile Sisters) composed of Nina and Veronica from Sweden and Alice Deejay from the Netherlands have only released two albums so far. The first one is 1999's lt;lt; Best99gt;gt;, the second one is 2001's "FUTURE GIRL" (Future Girl), the first one is not as popular as the first album, but it is still good, there is a song in it ;lt;KISSY, KISSYgt;gt;It also sounds good,lt;lt;DO BE DI BOYgt;gt;It is a strong dance song after REMIX. The Smiling Sisters even set off a whirlwind of "invincible youth" all over the world; BUTTERFLY, COCONUT, TIC TOC, and BOYS are all popular dance songs selected for dance carpets. ... Among them, "Butterfly" can be called the most classic dance machine dance music.