Aerosmith

Aerosmith with lead singer Steven Tyler and guitarist and Joe Perry play a free concert on Commonwealth Avenue in Boston. (Photo courtesy: TIMOTHY A. CLARY/AFP/Getty Images)

Aerosmith

Aerosmith with lead singer Steven Tyler play a free concert on Commonwealth Avenue in Boston on November 5. (Photo courtesy: TIMOTHY A. CLARY/AFP/Getty Images)

Aerosmith

Aerosmith arrives by Duck Boat to play a free concert on Commonwealth Avenue in Boston. (Photo courtesy: TIMOTHY A. CLARY/AFP/Getty Images)

Aerosmith

Aerosmith arrives by Duck Boat to play a free concert on Commonwealth Avenue. (Photo courtesy: TIMOTHY A. CLARY/AFP/Getty Images)

Aerosmith

Aerosmith with lead singer Steven Tyler and guitarist and Joe Perry play a free concert on Commonwealth Avenue in Boston. (Photo courtesy: TIMOTHY A. CLARY/AFP/Getty Images)

Aerosmith

Aerosmith arrives by Duck Boat to play a free concert on Commonwealth Avenue in Boston.( Photo courtesy: TIMOTHY A. CLARY/AFP/Getty Images)

Aerosmith

Aerosmith played a free concert on Commonwealth Avenue in Boston on November 5.The show was to promote their new album "Music From Another Dimension!" and also encouraging people to go out and vote on November 6. Photo courtesy: TIMOTHY A. CLARY/AFP/Getty Images)

Aerosmith

The view from the crowd. (Photo courtesy: WBZ-TV's Andrea Courtois)

Aerosmith

Crowds outside Comm. Ave. (CBS)

Aerosmith

Thousands gather. (CBS)

Aerosmith

The duck boats arriving. (CBS)

Aerosmith

Steven Tyler on his way to the concert. (Photo courtesy: TD Garden/Twitter)

Aerosmith

The stage was in the back of a truck. (Photo courtesy: WBZ-TV's Andrea Courtois)

Aerosmith

The view from inside the apartment building. (Photo courtesy: Steven Tyler/Twitter)

Aerosmith

Aerosmith plays a free concert on Comm. Ave. (CBS)

Aerosmith

Aerosmith plays a free concert on Comm. Ave. (CBS)

Aerosmith

The boats pull up with Aerosmith onboard. (Photo courtesy: Mix's Gregg Daniels)

Aerosmith

Tom Brady, Jerod Mayo, Robert & Jonathan Kraft. (Photo courtesy: WBZ Newsradio's Bernice Corpuz)

Aerosmith

Boston Transit Police in front of the stage. (Photo courtesy: Boston Transit Police/Twitter)

Aerosmith

Tom Brady, Jerod Mayo, Robert & Jonathan Kraft (Photo courtesy: New England Patriots/Twitter)

Aerosmith

The view from behind the stage. (Photo coutesy: Mayor Tom Menino/Twitter)