These are some of the parts of a song. Herewith is the proper and most logical order: introduction, verse, refrain interlude and coda. The introduction of the song is optional because this is usually just the instrumental or the introduction before the song is to be played. The verse on the other hand contains the story of the song. This usually has the storyline, mood or message of the song. Each verse has the same melody and chord patterns. This will lead the listeners to the chorus. Refrain is the part of the song which is repeated from verse to a verse. This is not a section but a part of the verse. Some of the refrains contain the hook or sometimes the title and tends to be the most memorable part of the song. Due to repetition of these lines, these are also the lines that will stick to your mind. Next is the interlude. Interlude is the short and optional part which adds extreme change or variety to a song. This is the section where the spoken rhythm is usually placed and this gives relief between choruses. Lastly, the coda is the part of the song which is special but optional ending section. The melody of the coda is taken from another part of the song. This is the grand finale.
