Any reason you're avoiding MSI? Their motherboards tend to be a good match for Ryzen 3000 CPUs, since they released an updated "MAX" lineup of B450 boards that support 3rd-gen Ryzen out of the box. And of course, B450 costs less than X570, which is quite relevant if you are trying to get the most performance for the money in this price range. Here's one example of what could be done with an MSI B450 MAX motherboard, though they also have other compatible boards for another $30+ less...
PCPartPicker Part List
CPU: AMD Ryzen 5 3600 3.6 GHz 6-Core Processor ($189.99 @ Best Buy)
Motherboard: MSI B450 TOMAHAWK MAX ATX AM4 Motherboard ($114.99 @ Best Buy)
Memory: G.Skill Ripjaws V 16 GB (2 x 8 GB) DDR4-3600 Memory ($74.98 @ Amazon)
Storage: Crucial MX500 500 GB 2.5" Solid State Drive ($64.50 @ Amazon)
Storage: Seagate Barracuda Compute 2 TB 3.5" 7200RPM Internal Hard Drive ($49.99 @ Walmart)
Video Card: EVGA GeForce GTX 1660 Super 6 GB SC ULTRA GAMING Video Card ($239.99 @ Best Buy)
Case: Phanteks P300 ATX Mid Tower Case ($49.99 @ Newegg)
Power Supply: Corsair CX (2017) 550 W 80+ Bronze Certified ATX Power Supply ($64.99 @ Newegg)
Total: $849.42
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2019-12-30 20:51 EST-0500
I also traded the 3600X for a 3600, which offers nearly the same level of performance, albeit with a smaller boxed cooler that may be a bit more audible. The 3600X could be found on sale for not much more than the price of a 3600 recently, which made it the better option, but at the current price it's arguably not worth paying close to $50 extra for. For music production, they may want a quieter cooler, though if that were desired, a 120mm tower cooler for around $30 or so would be quieter than either stock cooler.
You can save a fair amount on the RAM as well by going with DDR4 3600 speed, and there shouldn't be a perceptible difference in performance between that and 3733.
For storage, the hard drive you had listed was a refurbished model, so I swapped that for a new drive for $15 more. The Crucial MX 500 in turn costs about $15 less than a Samsung 860 Evo while offering similar performance and reliability.
And for the graphics card I went with a 1660 SUPER, which performs nearly at the level of a 1660 Ti. I notice you did put a 1660 Ti in the one build at a similar price, but it appears to be out of stock, and has mixed reviews with many of them mentioning the cooler being inadequate for the card, so there are probably better options.
I also went with a slightly more expensive case with a tempered glass side panel rather than acrylic, but there are of course a lot of options as far as cases go.
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