3. Why is this theme important in general?

A  song, most broadly, is a single (and often standalone) work of music that is typically intended to be sung by the human voice with  distinct and fixed pitches  and patterns using sound and silence and a variety of  forms  that often include the repetition of sections. the word "song" is widely used by people in the popular music industry to describe any musical composition, whether sung or played only by instruments. "written words created specifically for music or for which music is specifically created, are called  lyrics. if a pre-existing poem is set to composed music in classical music it is an  art song. songs that are sung on repeated pitches without distinct contours and patterns that rise and fall are called  chants. songs in a simple style that are learned informally are often referred to as  folk songs. songs that are composed for professional singers who sell their recordings or live shows to the  mass market  are called popular songs. these songs, which have broad appeal, are often composed by professional songwriters, composers and lyricists. art songs are composed by trained classical composers for concert or recital performances. songs are performed live and recorded on audio or video (or, in some cases, a song may be performed live and simultaneously recorded). songs may also appear in plays, musical theatre, stage shows of any form, and within operas.