"...the Sousaphone received its name through a suggestion made by me to J.W. Pepper, the instrument manufacturer of Philadelphia, full 30 odd years ago. At that time, the United States Marine Band of Washington, D.C., of which I was conductor, used a B-flat bass tuba of circular form known as a 'Helicon.' It was all right enough for street-parade work, but its tone was apt to shoot ahead too prominently and explosively to suite me for concert performances, so I spoke to Mr. Pepper relative to constructing a bass instrument in which the bell would turn upwards and be adjustable for concert purposes. He built one and, grateful to me for the suggestion, called it a Sousaphone. It was immediately taken up by other instrument makers, and is today manufactured in its greatest degree of perfection by the C.G. Conn Company ..."
- Quoted from an interview with John Philip Sousa in the Christian Science Monitor, May 30, 1922, as published on www.jwpepper.com