  Melody estimation or melody extraction refers to the extraction of the
primary or fundamental dominant frequency in a melody. This sequence of
frequencies obtained represents the pitch of the dominant melodic line from
recorded music audio signals. The music signal may be monophonic or polyphonic.
The melody extraction problem from audio signals gets complicated when we start
dealing with polyphonic audio data. This is because in generalized audio
signals,the sounds are highly correlated over both frequency and time domains.
This complex overlap of many sounds, makes identification of predominant
frequency challenging.
