"We've seen the Towson parade grow from small into mammoth," said John Ziemann, president of Baltimore's Marching Ravens. About 35 of the 150-member band will march on Friday, just as the band has for more than 20 years — since back when they were known as the Batlimore Colts Marching Band. "We used to wear full dress uniforms — jacket, long pants, hat — that we use now for games," Ziemann said. "We learned our lesson the hard way. People were dropping from the heat. So we have a summer uniform of purple polo shirt with the band logo, black shorts, white socks, white tennis shoes and a Ravens baseball cap. You have a lot less people dropping."