If you were fortunate to be passing through the Thompson Center yesterday afternoon, you would have overheard world-famous Yo-Yo Ma and Renee Fleming performing in the food court with other Chicago Symphony musicians and a choir of high school students. This "flash mob" was a completely unexpected by most, while some had received an email from the Chicago Symphony Orchestra that something was going to happen that day. Who are Citizen Musicians? They are a group of musicians and music lovers of all levels as varying music institutions, who aim to make a difference in the community through music. For more info visit them at http://www.citizenmusician.org/. Its great to see the Chicago Symphony Orchestra bringing music out to the people!