Good point, I was trying to briefly summarize Marcuse's view but I did not do a good job.

Marcuse view was that we think of ours as a materialist culture, but we are beyond the need for material goods in the sense that our productive capacity far exceeds our needs (but of course, we distribute unevenly so that there are still some in material need.). Demand is driven by emotional needs rather than material needs. And the stuff we buy often does not satisfy the emotional need, hence demand becomes unbounded.

But a musical instrument is perhaps something that can lead to emotional fulfillment.

(Marcuse was a sort of neo-Marxist and was pushing the idea that the capitalist system exploited this to create unbounded demand. I don't mean to push that view, I just think some of the premises of his argument have merit and is relevant to the topic. After all, some of the pre-capitalist rich seemed have an unbounded desire for riches.)