There are many ways of responding to music - what is appropriate depends on many factors, including the genre, style of music, nature of the event and venue, and cultural norms. Moving to musio or even dancing may be the most appropriate response in some circumstances, but in others it can show a mindless inability to appreciate what the music is really trying to convey.

Just because people are sitting still and concentrating does not mean they are not appreciating or enjoying the music.

As for earplugs, the Musicians Union and RNID have both been campaigning for a long time to encourage both musicians and audiences to wear earplugs. Loud music can damage the hearing very easily, but takes years to make itself evident. Wearing earplugs should be encouraged - why and to whom is it offensive?