Song written for the Umbrella Revolution: 撐起雨傘 Raise The Umbrella
Composer: Pan
Lyricist: Pan/Albert Leung (Lin Xi)
Singers: Denise Ho, Anthony Wong, Deanie Ip, Kay Tse, Endy Chow, Ellen Joyce Loo.

This isn’t an official clip, the uploader (Alice Tong) put the song to photos she took, plus photos from various news sources. Really nice job!

More info about the song on facebook.

As the Taipei Times pointed out, there is a risk for entertainers to show support in this way.

(Source: https://www.youtube.com/)