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Some companies make a lot of money by selling ringtones. The music industry also benefits by receiving royalties from cell phone manufacturers who license their sounds. Technology has also contributed to the success of ringtones. Cell phone manufacturers use RTTTL (Ring Tone Text Transfer Language), a programming language that was created by Nokia. Today, there are two main types of ringtones: polyphonic and monophonic. Monophonic ringtones only play one note at a time.