It is not so easy anymore. Even people who love classical music find themselves bereft of the act of will necessary for blocking out forty uninterrupted minutes away from telephone or computer. Halfway through the adagio they feel a tickle somewhere between the temporal and occipital lobes and realize they are fighting an impulse to reach for a magazine-but no multitasking now, please! The great symphonies and concertos and operas and chamber pieces from 1700 onward, the works that make up the core repertory of classical music, were composed with the idea that listeners would be attending to them with all their conscious minds, having arranged their schedules and perhaps paid money to occupy a seat in a concert hall for a set time. Listeners were enclosed in ritual spaces, with nothing to do but listen and watch. Now there are other temptations.