(AIR ON MONDAY MAY 25 - MEMORIAL DAY) Marching Bands, floats, and antique cars will make their way through West Duluth today for the annual Memorial Day Parade. The Duluth-Based Northwind Drum and Bugle Corps will be there. Once common; community-based Drum and Bugle Corps are few and far between. Members of the Northwind Drum and Bugle Corps are getting on in years, and worry whether they can muster enough healthy musicians to continue another season. Minnesota Public Radio's Bob Kelleher Reports: It's as American as Apple Pie. Think of a parade and you think of flag brigades; flying batons, and brassy music belted out by br