In addition, the ring-shaped structure hung within the shell, supporting lights and acoustic clouds, echoes a somewhat similar structure hung within the 1927 shell. During the 2004 season, because the back wall was not yet finished, a white curtain was hung at the back; beginning with the 2005 season, the curtain was removed to reveal a finished back wall. The architectural design for the shell was developed by the Los Angeles-based architectural practice Hodgetts and Fung, with the structural concept developed by the local office of Arup. At the same time the new shell was being constructed the bowl received four new video screens and towers. During most concerts, three remotely operated cameras in the shell, and a fourth, manually operated camera among the box seats, provide the audience with close-up views of the musicians. The Hollywood Bowl has had several house orchestras. A "Bowl Orchestra" performed in 1925, and a "Hollywood Bowl Orchestra" made a live recording in 1928. Later, the "Hollywood Bowl Symphony Orchestra" recorded made several classical recordings under music director Leopold Stokowski from 1945 to 1946, and released a number of recordings on the Capitol Records label in the 1950s and 1960s. The Hollywood Bowl Orchestra was re-launched by the Los Angeles Philharmonic Association in 1991 under principal conductor John Mauceri, who finished his tenure in 2006. From among the Orchestra's more than 300 concerts, Kathleen Battle, Plácido Domingo, Jane Eaglen, Marilyn Horne, Alexander Frey, Jennifer Larmore, Sylvia McNair, Andrea Bocelli, Gil Shaham, Stephen Hough, Luciano Pavarotti and the San Francisco Ballet represent the illustrious talent from the worlds of opera, ballet and classical music that has graced the stage with the Orchestra. Trisha Yearwood, Garth Brooks (in his only performance with an orchestra) and the late John Denver brought to their performances the irrepressible optimism of Country-Western. Jason Alexander, Carol Burnett, Kristin Chenoweth, Kirk Douglas, Patti LuPone, Reba McEntire, Lynn Redgrave, Peabo Bryson, Harry Connick Jr., Alan Cumming, Davis Gaines, Savion Glover, Joel Grey, Garrison Keillor, Leonard Nimoy, Brian Stokes Mitchell and Patrick Stewart have brought their inimitable gifts to the Bowl stage. Hosting Big Bad Voodoo Daddy, Chicago, Cheap Trick, The Chieftains, Sergio Mendes, The Moody Blues, Pink Martini, Tito Puente and the Latin Jazz Ensemble, Royal Crown Revue, and Rufus Wainwright, the Orchestra has proven itself in the world of pop and rock.