Avoid “FLAC” downloads from random blogs. Many are upsampled MP3s. Verify file integrity using Spek (a spectrum analyzer). A true FLAC from CD shows frequency content up to 22.05kHz. An MP3 transcode shows a sharp cutoff at 16kHz or 20kHz.
Critically, no single FLAC folder can contain "the complete Beatles" without version control. The 2009 mono FLACs are considered the definitive historical document, while the 24-bit anniversary FLACs represent modern de-mixing technology. the beatles discography flac work