f(x)'s Amber will "Shake That Brass" for her title track!

Amber's mini album 'Beautiful' will be released online on the 13th ahead of its physical release on the 16th. Her title track "Shake that Brass" is an urban hip-hop song with a brass sound and conveys the message of forgetting about your worries and enjoying the moment. Amber also took part in writing and composing the song, for which Girls' Generation's Taeyeon will be participating as a featuring artist.

Amber will also kick off her solo-debut stage on KBS 2TV's 'Music Bank' on the 13th!