A polyphonic ringtone is a ringtone that makes
use of polyphony.
The first polyphonic ringtones used sequenced recording methods such
as MIDI. Such recordings specify what instrument should play a note
at a given time, but the actual instrument sound is dependent upon
the playback device.
Later, it became possible to use digital audio recordings as
ringtones. The recordings might be of music, speech, or other
sounds. Mainstream music recordings used as ringtones are sometimes
called "realtones" or "truetones". Real tones, which are often
excerpts from pop songs, have become popular as ringtones. A recent
innovation is the singtone, whereby the user’s voice is recorded to
a popular track and then “tuned-up” automatically to sound in key.
This can then be downloaded as a ringtone or sent to another user’s