This should be discussed from two aspects. The first is historical reasons, because records were influenced by technology a long time ago. They can't record this kind of music for a long time. Due to the influence of technical means, they can only record music in five minutes. Another reason is that people now have this kind of aesthetic fatigue. Singing is basically a lyric, playing a lyric. If they sing too many times and for too long, it will affect people's listening to songs. Therefore, the normal control of songs in three or four minutes, there are two or three songs of small climax, can fully satisfy people's this kind of thing. It takes too long, but it is not conducive to the better popularization of songs. And if the time is too long, the singer will feel tired when singing, which will affect the vocal cords.