As of Dec. 1, the instrumental tune “Sleigh Ride” was the most played song of the holiday season, according to the American Society of Composers, Authors and Publishers. Since Oct. 1, Leroy Anderson’s symphonic piece, first played by the Boston Pops in 1948, had been played more than 64,317 times across America. The question of what deranged radio stations started playing holiday music one month before Halloween, however, remains unanswered.