http://cambridgechorus.org/ Amateur group reflecting the broad diversity of racial backgrounds, ages, religions, and political philosophies that comprise the city of Cambridge. http://ftp-swiss.ai.mit.edu/~jaffer/CFO.html Offering music for international folk dancing and weddings. http://www.cambridgemadrigals.org/ Cambridge-based ensemble performing a cappella and accompanied works from all musical periods. http://www.cambridgesymphony.org/ Adult amateur musicians dedicated to performing good music at free concerts in and around Cambridge. Site includes concert schedule and directions. http://www.cantatasingers.org/ Group performing choral, orchestral and vocal chamber music from J.S. Bach to the 21st century. http://web.mit.edu/bavicchi/www/ Performing original works for winds since 1948; site includes concert and rehearsal schedule. http://radiusensemble.org/ Chamber ensemble performing contemporary music. http://www.rylesjazz.com/rjo/ The house big band at Ryles Jazz Club, directed by Frank Vardaros. Site includes concert schedule. http://www.samdavis.com/ Offering private guitar lessons in jazz, blues, rock, folk and funk for beginners through professionals. http://www.thedoubledeckers.com/ Cambridge-based ska band with influences of ska, pop, rock, funk, and swing. http://www.worldmusic.org/ Concerts from around the world, presented at Sanders Theater, the Somerville Theater, and other venues. [Requires frames]