What wows 'em are Broadway-style showstoppers, with music and lyrics by Stephen Schwartz, whose work has become less tuneful and more pretentious since the heady days of Godspell and Pippin . Schwartz's rhymes are all of the moon-June variety, and the big inspirational number, in which hope is conceded sometimes to fly away, like silver birds,  Who knows what miracles you can achieve/ When you believe?