Hart's Music Center and Hart's Trailer Sales are both owned by John P. Hart. Mr. Hart is a graduate of Southern Illinois University at Carbondale with a bachelor of science degree in Mechanical Engineering.

Hart's Music Center is a retail music store located in Harrisburg, Illinois. The store has been owned and managed by three generations of the Hart family and has been managed by John Hart since 1980.

Hart's Trailer Sales is also located in Harrisburg, Illinois. The business was started in 1988 by John Hart. It is a franchised dealer for Haulmark Industries, manufacturer of a complete line of enclosed cargo, racing, and concession trailers.