Arthur Pryor, Ralph Corey, Kid Ory, and William “Willy” Cornish were exceptional trombone soloists at the turn of the twentieth century who brought the trombone center stage from the back seats of America’s concert and jazz bands. The instruments that these leading trombonists played on and often endorsed during this time were manufactured by such companies as C.G. Conn, Frank Holton, Henry Lehnert, F.E. Olds, C.W. Osgood, and Morceau. Each company’s latest innovation for their instruments’ new metallurgical enhancements, slide oils, water keys, mouthpiece designs, and finishes were celebrated through newspaper advertisements in music magazines, company display shops at most the country’s World Exposition Fairs, and live performances by the musicians and bands that utilized these instruments. The collaborative interaction between manufacturer and performer not only led the way for new trombone designs but also helped promote the trombone as America’s most popular instrument of the brass family. Through historical advertisements, photographs, sheet music, and music instruments from the Sousa Archives’ trombone collection, this exhibit will explore changes in American trombone design and manufacture between 1890 and 1925 to illustrate how these technological and performance enhancements to the trombone were jointly shaped by the country’s leading trombonists and the music instrument companies that continually sought the endorsements of these musicians to help market their professional and student model trombones across America. For more information, visit http://archives.library.illinois.edu/sousa/american-music-month/.