One of Boston’s finest avant-garde (free) jazz ensembles performed two totally improvised pieces, lasting a total of about an hour and a half, for an audience of about 50 students, faculty members, and visitors, to conclude the three week long Through the Virtual Looking Glass exhibition in Boston. Like the visual art in the exhibition, the concert was a mixed reality event. As the real life muscians played for the Boston audience, their music was streamed live into Second Life where it was converted into a performance of avatars at the virtual Pop Art Lab, and enjoyed there by an audience of avatars whose operators were physically resident in a dozen countries. The avatar performance was in turn displayed on a 24 inch Mac Cinematic Flat Screen Monitor where it could be viewed by the Boston gallery audience alongside of the real life performance. The music, which one member of the Boston audience described as “transcendent,” involved complex and changing rhythms, atonal passages, and spontaneously generated melodies, all emerging almost magically without any score from the near subliminal coordination of the musicians. The masterful free jazz musicians - Jacob William, Jim Hobbs, Forbes Graham, Steve Lantner, and Laurence Cook - took a circuitous musical  trip on a flux of avant-garde sound from the “real” world, through the virtual looking glass, and  into Second Life, while their avatar doubles passed in reverse direction from the virtual world into the real gallery space in Boston - hopefully only the first of many such journeys between worlds.