Are the FLACs from free-mp3-download.net legitimate? I found one song that has cutoff at ~16kHz (top). Most songs still have some cutoff at the top like 320K MP3 (middle) plus there's some
320kbps vs FLAC – Which is Better and How to Convert them to each other?
MP3 is Dead - 128Kbps Vs 320Kbps? - YouTube
320kbps MP3 - Why is there a clear line near 16khz on spectrogram? - Sound Design Stack Exchange