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Types of ring tones:
Monophonic
Early phones had the ability to have ring tones programmed into them using an internal ring tone composer. Later, various formats were developed to enable ring tones to be sent via text using RTTL encoding.
Polyphonic
Many phones are now able to play more complex polytones; up to 40 individual notes with different instruments are played simultaneously to give a more realistic musical sound. Mobile phone handsets manufacturers have taken full advantage of new technologies to improve speakers in order to produce a better sound quality. Some polyphonic ring tones are now almost as good as the original records, and the quality is continually improving. It is likely only a matter of time before all new mobile phones are produced with polyphonic capabilities.
Voice
A new version of ring tones, called voice ring tones, true tones, or dead ringers, now use actual pieces of music, along with all lyrics and the entire song backing music, including backing singers. They are usually contained in MP3, WAV, or AMR format that can be used as a ring tone on many series 60, symbain or smart phones. Many cell phone manufacturers are including voice ring tones on most of their newly released phones, including Motorola, Nokia and Sony Ericsson [Source: Wikipedia]