For the serious collector, a folder full of FLACs is useless without metadata. Ensure your files have:
The first album that truly benefits from high-sample rates (96kHz/24bit FLAC). The percussion on Rain Fall Down contains high-frequency shakers that exceed the Nyquist limit of CD audio (22.05kHz). If you have the HD FLAC, they exist. If not, they are gone. The Rolling Stones - Studio Discography -FLAC- ...
The quality of a "Studio Discography" pack depends entirely on which mastering era the uploader used. The Stones have three major CD eras, and a good review must warn you about this: For the serious collector, a folder full of
The Don Was production era. These are aggressively compressed CDs, but in 24-bit FLAC (where available), the dynamic range opens up. Listen to Out of Tears (1994). The acoustic guitars are so clean you can hear the squeak of fingers on fretboard—absent in 320kbps MP3. If you have the HD FLAC, they exist