When Richard M. Sherman, one half of the legendary songwriting team The Sherman Brothers, passed away last month, The Second Disc was quick to pay tribute to all the duo's great works for Walt Disney films and elsewhere. But their most towering achievement is probably the song score to the whimsical Mary Poppins. This summer, to celebrate the film's 60th anniversary, Disney will release a limited edition vinyl box set collecting the film's original soundtrack, rare archival material and no less