Robert Johnson: Ramblin' On My Mind, 1936  This is an example of a very old studio recording. I took this snapshot at 0:17min (Robert Johnson sings and plays guytar)   1. original sound/lossless compression This is an old studio recotding - you can see that the obsolete microphone that was used for this session was not very sensitive to trebles. (see "Hey You" for confrontation)   2. mp3 compression (320kbps, BladeEnc. 0.91) Mp3 / 320kbps doesn't seem to affect the original a lot - just  top trebles seem to be damaged   3. mp3 compression (160kbps, BladeEnc.0.91) After pushing to 160kbps all frequencies over 16kHz completely disappear.