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A GANA is a musical composition intended to be performed by the human voice. This is often done at distinct and fixed pitches using patterns of sound and silence. Songs contain various forms, such as those including the repetition and variation of sections.
a short poem or other sets of words set to music or meant to be sung.
OR
the musical phrases uttered by some birds, whales, and insects, typically forming a recognizable and repeated sequence and used chiefly for territorial defense or for attracting mates.