Eric Clapton: Layla, 1975, an audience recording 

This comes from the well known ROiO "Legendary LA Forum Show" and it is an example of a "not so" old audience recording.
I took the snapshot at 0:06min (at the moment when people start clapping)

1. original sound/lossless compression
Note that the upper part of the original spectrum has already been a little bit affected during the recording by the attributes of the  microphone used

2. mp3 compression (320kbps, BladeEnc. 0.91)
the sound-distortion in progress

3. mp3 compression (160kbps, BladeEnc.0.91)
good by trebles :))