Recommend good sites to purchase high resolution music

"High resolution music". Sounds like a windup to me.
Musc is analogue in its best form. A good quality record player can produce a bandwidth between 42HZ and 15kHZ.
CD and digital audio is analogue without any harmonics, we call that compression.
Audio is detectable between 35HZ and 18kHZ (if you have very young ears).
Amplifiers are tailored between 20HZ and 22kHZ. Any higher or lower is wasted power as the human ear cannot hear it.
 
I think depends. I don't think DSD would be better than say 192K sample rate at 24 bits. 96K/24bits is probably about the same. Not sure if either is available online to download. A rough estimate for PCM is 6db x #bits for SNR or 144db for 24 bit and bandwidth is just Fs/2. Both of these are theoretical values.
 
"High resolution music". Sounds like a windup to me.
Musc is analogue in its best form. A good quality record player can produce a bandwidth between 42HZ and 15kHZ.
CD and digital audio is analogue without any harmonics, we call that compression.
Audio is detectable between 35HZ and 18kHZ (if you have very young ears).
Amplifiers are tailored between 20HZ and 22kHZ. Any higher or lower is wasted power as the human ear cannot hear it.

Depends what you mean by hearing, when a bus goes past you are aware of the sub 20Hz resonances, getting subs to go below 20 Hz I find worthwhile to recreate the scene and ambiance