Ghastly isn't it! Piped music anywhere is ghastly, I walk out of shops and restaurants that indulge in this awful practice as I regard it as a form of pollution.
Studies that have shown that in restaurants where there is lively music people tend to eat faster, and thus more, as the stomach is slow to tell the brain it's full, so the faster you eat the more you eat. Further, it vacates the tables faster for the next victims.
On a 'plane, as a captive audience, there is nothing you can do except express your displeasure to the CC in the hope that if enough people do so, the practice will be stopped eventually.