Many of the everyday tasks performed by professional workers are done in the serial processing center of the left brain. Music will not interfere particularly with this work, since it’s the brain’s holistic right side that digests music. But not all of the work is centered in the left brain. There is that occasional breakthrough that makes you say “Ahah!” and steers you toward an ingenious bypass that may save months or years of work. The creative leap involves right-brain function. If the right brain is busy listening to “1,001 Strings” on Muzak, the opportunity for a creative leap is lost.