Music is math. Art is patterns. Like how we're using AI to iterate through design and code, musicians could use it for generating musical patterns including chords, harmonies, melodies, and rhythms. In theory, it can pull up and manipulate instruments and effects based on description rather than rifling through file names and parameters (i.e. the boring stuff).
Most success as a musician stems from developing a unique style, having a unique timbre, and/or writing creative lyrics. Whether a coder, designer, artist, or musician, the best creatives start by practicing the patterns of those who came before. But most will never stand out and just follow existing patterns.
AI is nothing more than mixing together existing patterns, so it's not necessarily bad. Some people just want to play around and get a result. Others will want to learn from it to find their own thing. Either way works.