In German we distinguish between 'Interpret' (the one interpreting or performing an art) and the 'Künstler' (artist). I think this explains it very well: Most of the popular 'Interpreten' are not famous for their exquisite music, but for who they are, as a brand, and how they perform in public and on stage.

The movie Yesterday is such a farce because it suggest The Beatles songs are super successful no matter who performs them, as long as they are the first to perform them. When effectively it was a mix of having skilled musicians, produce and perform good songs on the one hand, but also who they were, the marketing and their performances on the other hand.