but the main attracti is undoubtedly this man. ♪[ music >> it's like a dream come true for rock fansn san francisco. members of rolling stone, the who, eric clap tob and many more all together on stage for one concert at same time. we're backstage, but a little earlier tonight this is what the concert looked like: ♪ lay did you know sally. ♪. >> reporter: it's a special night not just because of the music, but because of the cause, to raise money for action research for multiple sclerosis. rockstars aren't generally known for clean living burb these british superstars decided to donate their time because a friend of theirs came down with ms. ronnie lane, once a rockstar himself who played with rod stewart and the faces has had multiple sclerosis for seven years and now confined to a wheelchair. backstage, before the show tonight, some of the producers and stars talked about the concert and ms. >> we're here to raise money for multiple sclerosis sufferers everywhere. >> it will go to establish a branch of the charity established in england in the united states, and the all the money r