Yeah, one of the new Mac Mini's would be a great choice for music, just don't attempt any intensive video editing with it since it only has built in Intel graphics.
The funny thing about my iMac Pro is that even when rendering most projects in FCP X, there's almost no fan noise. An older iMac I had would sound like a wind tunnel with similar projects. That tells me that my iMac Pro is not even anywhere near maxing out.