There is a little trick to determine the original motivation of the creator (note that it is motivation, not thinking). You play through the songs that need to be analyzed on piano or guitar. After walking through, you will find that some songs are played on piano. It sounds weird, and it's not even suitable for playing with a piano at all, so the original motivation for this song was probably the guitar. But this technique is also for reference only. Judging the motive of a song is no different from solving a crime. It requires thinking and tracing from many details. In fact, the creative motivation behind many songs is difficult to accurately judge. It involves many complex reasons such as the creator's personal habits, song style, arrangement and remake, and in the first half of these years, the second half of the keyboard is replaced by a guitar or two. It is very common to create with one instrument or even multiple instruments together, because the keyboard can easily focus on the melody itself, while the guitar can easily give the corresponding rhythmic color. Both have their own characteristics and complement each other.