In the era of the iPod, any music is available at any time, wherever you are. But Bernard Holland wonders if maybe this easy access doesn’t cheapen the musical experience. “Is it all too easy? Any music critic will tell you that the eager anticipation of new recordings fades with their unsolicited, almost daily flow into the office. Would knowing a little less actually make us smarter, or at least hungrier? I do wonder if spiritual muscle tone is being softened.”