Outside of City Hall, chants could be heard as signs waved in support of a social movement that has been seen on the streets of San Francisco for generations.

Last week, people raised their voices to fight intolerance, restore promised rights and raise awareness about the consequences of Proposition 8.

Inside City Hall, in somber chambers on echoing walls, the recorded history of rock bands and their mark on social change is now on display.

"The exhibit is a hotbed of social issues," said Joyce Grimm, the programs and events coordinator of the San Francisco Art Commission Gallery. "A lot of what is displayed is what went on in San Francisco from the 60's to now."

Grimm helped curate the new exhibit at City Hall. "The Art of Change: The Influence of Rock Music and Art on Social Change."

This exclusive multi-media exhibition -- featuring iconic photography, rock and roll posters, and live music memorabilia -- originated from the Wolfgang's Vault. The Vault is the world's largest collection of live concert recordings and music memorabilia, which includes the vast archive of Bay Area music promoter Bill Graham.

Born Wolfgang Grajonca in Berlin during 1931, Bill Graham escaped Nazi Germany and moved to New York, eventually hitting San Francisco in the mid-60s. The Wolfgang from Wolfgang's Vault was Bill Graham, the man whose genius for bringing performer and audience together shaped the rock concert as we have come to know it.

"A lot of the photographs you see here are from photographers who worked with Graham and moved on to work for Rolling Stone," Grimm said. "This is just sort of a taste of the vault and how these artists relate to San Francisco."

Around 200 pieces are on display, starting at the ground floor stairs of City Hall with pieces from 1966, and wrapping around the whole bottom level, ending at the other side of the staircase with art from 2008.

One unique aspect of this installation is that here, it isn't rude to be on your phone for this exhibit -- it makes you a more engaged participant in the show.

The Art of Change is using "Guided by Cell" technology that allows visitors to listen to interviews and personal accounts recorded exclusively for this exhibition from the represented musicians, photographers and graphic artists. Most notably, visitors can dial-up Tina Turner, who gives her own account of Feminism and the Sexual Revolution.

Those who make their way to this exhibit can see a glimpse of their rock music memories in San Francisco over the last five decades.

"It's more than music shown here, it's culturally significant what is depicted here. The time period here was a huge part of my life," said Lynn Ingersoll, photography professor at the Academy of Art in San Francisco. "Bill Graham was responsible for resurrecting some great careers. He did that for Tina Turner by bringing her in for some of those benefit concerts."

Others learned about the display and came to see pieces of rock history that they wish they could have experienced first-hand. Most of the art displayed was unknown to them and they were able to learn about the work that Bill Graham had in raising money for a diverse range of social issues with his musical connections.

"I am getting a lot out of the history on the walls here," said Janet Gatihi, photography student at the Academy of Art in San Francisco. "I think about the huge history and see how compelling the last thirty years in music have been."

Some of the notable pieces displayed include the first Craw Daddy magazine from 1966 with Bob Dylan on the cover, labeled "The magazine of Rock 'n' Roll". And the price for this magazine? Just 25 cents. Another is Dick Gregory's photo of the fallen, injured or dead during the Kent State riot in 1970. The audio that goes along with the photo is a live concert recording of Crosby, Stills, Nash and Young's "Ohio".

Social movements represented include the legalizing of marijuana, earthquake relief, after-school culture, ending nuclear power and several peace and rehabilitation initiatives. One poster was from the 1966 Benefit Ball with the Grateful Dead for the end of marijuana prohibition that was held in California Hall, located on Polk and Turk. The poster noted on the bottom that "Tickets [are] now on sale at Psychedelic Shop (S.F.), City Lights Books (S.F.) ... or at the door for a mere two dollars."

One poster promoted 11 performers that fought for "Students in Need, Athletics Culture and Kicks". The plaque next to the artwork stated that 50,000 people attended and raised enough money to keep extracurricular activities running for a year.

Famous photographer Baron Wolman was displayed a few times. He was the first official Rolling Stone photographer and known for his ability to build a good rapport with his subjects. One of his pieces displayed was a rare photo of Jerry Garcia with his right hand up showing the result of a childhood injury that cost him the top of his middle finger. The audio that accompanies it included an interview Garcia gave in 1982 where he explained the injury and how it affected his musical career.

One of the last items displayed is Shepard Fairly's red, white and blue poster of Barack Obama. The description next to it stated, "More than any past U.S. election, musicians engaged in the political process of backing a candidate from president."

This project will be on display until April 13. More info at http://www.wolfgangsvault.com/.