Last week, the San Francisco Gay Men's Chorus helped celebrate the marriage of Proposition 8 plaintiffs Kris Perry and Sandy Stier.

The couple married in San Francisco City Hall moments after an appeals court ruled California's gay marriage ban invalid following a Supreme Court order.

Standing inside City Hall's rotunda, the group sang an excerpt of a new song called San Francisco from Andrew Lippa's oratorio I Am Harvey Milk. The chorus premiered the work days before during its 35th anniversary concert Harvey Milk 2013.

A video posted online Thursday, includes footage of the chorus singing San Francisco and Give 'Em Hope, Harvey Milk's catchphrase. Among those seen in the footage attending the ceremony are San Francisco Mayor Ed Lee, Human Rights Campaign (HRC) President Chad Griffin and Oscar-winning Milk scribe Dustin Lance Black.

The four-and-a-half minute video also includes footage of the celebrations that followed after the high court's ruling. (The video is embedded on this page. Visit our video library for more videos.)