This paper is a case study of the music production process using AI tools for 10 weeks for 9 college students. Participants used AI to perform the entire process from composing, writing lyrics, creating album art, and distributing music, including the process of releasing music on Spotify. The results of the study confirmed that AI accelerates the idea generation stage but compresses the existing preparation stage, and causes difficulties for novice users in the idea selection and verification stages. In addition, a new “collage and improvement” stage was identified that combines and refines AI-generated results, and AI also affects the social dynamics and role division between human creators. Based on these insights, we propose a human-AI co-creation stage model and a human-AI agency model.