Mstislav Rostropovich has pulled out of the Bolshoi Opera’s world premiere production of the Prokofiev opera, War & Peace, after becoming frustrated with the lack of professionalism at the company. The cellist and conductor had reportedly clashed with Bolshoi management, and was further upset by singers he found to be unprepared, and by an orchestra that featured a continually revolving roster of musicians. The production was to have marked Rostropovich’s return to Moscow’s musical fold, seven years after his last performance there met with unfavorable reviews.