Disc Jockey Service business. Bring a reception or other celebration to life by supplying the music. Business Overview One of the best part-time entertainment businesses that can be started is a disc jockey service, as not only are disc jockey services in high demand, but the business can also be initiated on less than a $10,000 investment and the monthly operating overheads are virtually nonexistent. There are basically four ingredients required to start and operate a...