Only you need an
i7 if you want use something like
HQplayer to upsampling the audio very high.
With
i5 you need enough to
multimedia. To music, an
i3 is enough. The most reasonable, thinking about the future, is an i5. To save, let it be from the previous generation.
I cannot comment on the new AMD
(to games are very appreciated the Ryzen). Many years ago I had an AMD K6-2 300
(W98, NT and Linux).
The best thing is that it is
custom like my PC, with a
silent power supply and
low ripple at 5V
(USB), as well as the rest of the fans. At EU, the german
Bequiet! is a cheap/good/
silent SMPS with
low ripple. And a
silent case, Cooler Master has one
silent and cheap.
Yes, silent is a very important word in audio, like noise.