@HTI: When recording loud music at a gig or event, the quality can largely depend on the acoustics of the venue, and your position in the room. If you're outdoors, the same can be said of where you're stood in relation to the speaker setup. If you're looking for improved audio quality in these instances then you may wish to invest in an external mic. On the S21 itself, try heading to Settings > Sounds and Vibration > Sound Quality and Effects > Equaliser, and having a play around with the settings here. You could also head to the Gallery app > Tap the 3 lines in the bottom right > Videos > Select the relevant video > Tap the pencil symbol to enter Editing Mode > Scroll to the right and tap the musical note > Video Volume, and move the slider to the left to reduce the volume, and the intensity of any bass distortion you may have captured.