So he began to study and analyze songs by groups such as the Beatles and the Bee Gees to understand their musical structure and form. Later, he applied his insights to his own creative work. Cheng Chih-jen is not a prolific songwriter.
於是他深入拆解、研究 Beatles、Bee Gees 等樂團的歌曲，了解歌曲中結構與曲式的變化，日後再應用到自己的創作中。