Hard disk for Music Server

I am building a PC as a Music Server.  Looking for help to pick hard disks.
Planning get 10 GB.

I am trying to get the best drives.....
Should I have say three 4 TB drives rather than one 10 TB?
How much capacity can one fill before it impacts performance? 70 %
Disk speed 5400 or 7200 rpm?
Brand of disk - HGST Ultrastar, WD Red, or WD Gold?

Thank you.
If you get 3 hard drives of 4G capacity, are you going to create a RAID 0 array to get your 10+G of space?
I worked for a hard drive manufacturer for many years and for music, it really doesn’t matter what type of drive you get. For music, you won’t see any difference in speed between 5300 or 7200 rpm. Actually, I even recommend against ssd for music. If you are using Roon or another app that has an index to your music, keep the index in memory or place that on ssd, that will give you better performance. If you build a RAID array or buy a single large disk, make sure you get a bigger disk to use as a backup
If you go with the  WD Red watch the model number. There was some recent controversy about the labeling and the storage method. See  https://arstechnica.com/gadgets/2020/06/western-digital-adds-red-plus-branding-for-non-smr-hard-drives/ 

Using 4 of the Red WD40EFRX 4TB in a RAID 5 configuration in my NAS with no issues. 
Raid 0 offers no backup, it only spans more than one drive into volume (s) Very bad if there is a drive failure. Raid 5 is good but difficult to repair if there is a failure. 1+0 is much better, gives you failure, hot swaps without downtime or data loss, but during the failure time you will suffer data SLOW downs big time, on a network sharing the files..

More smaller, faster, drives with STRIPPING, will blow your mind with speed. SSD RAID 1+0, 4-10, 2 gig SSD drives, Hot rod buddy...
FTH comes to mind, Faster than hell.

I ran SCSI II raid on my old Novel networks, for some manufacturing software...The 60 meg BOOT drive weighing close to 60 lbs each. Priam, drives with 10" platters? I think......OLD SCHOOL...LOL They were Raid 5 X 5s The rack was close to 400 lbs, the system 36, IBM ran on 220-240.  What a watt sucking setup....Sure was cool, though...HOT, was more like it, come to think of it.. Made barrels of all things...Paper, metal, HS, polys, overpacks....