The Music Man showed up here the other day, hoping to separate school kids from their money.Like the fictional Prof. Harold Hill, whose fast talking convinced residents of River City, Iowa, to invest in a boys’ band, this Music Man raises hopes, makes promises and leaves town with the loot. He’s worked this con across the U.S. for more than a decade.Each year some 20 schools cough up a total of over $5 million because they mistakenly believe they’ve earned the “honor” to play in London’s New Year’s Day parade.