Original sentence: Drum Corps Historical Society (DCHS).Early lines in the 1920s added D crooks on some horns in order to play more complicated songs in two lines, similar to a handbell ensemble.However, it wasn't long before some members in some corps wished to add more notes to their brass repertoire.Manufacture of horizontal-piston bugles ceased in the 1990s with the desire of competitive corps management to convert to band-like three-valve brass instruments pitched in B-Flat, although today the honorary term "bugle" is applied to all competitive corps brass instruments.Osmond Post Cadets  Drum & Bugle Corps site offers insight to the corps experience from the late 1920s to 1960's.PAL Philadelphia Police Cadets Drum & Bugle Corps 1965-1985
Edited sentence: However, some members in some corps wished to add more notes to their brass repertoire.Manufacture of horizontal-piston bugles ceased in the 1990s , as most bugles were being sold to DCI drum corps, which legalized two-value vertical piston instruments in 1977 and three-value instruments in 1987.Some corps in the 1920s added D crooks on some horns in order to play more complicated songs in two lines, similar to a handbell ensemble