I have to say I dont agree with you.
Some songs have an awkward point where you can't clap (like, at the end of something VERY sad or in transition)...but in most cases, applause is certainly expected and planned for.
As for applause when a character first enters, I think that there should be applause when someone that merits respect or is a legend comes on. It is expected--and i feel, rightfully so. Each audience differs with this.
(and i hope you arent speaking of your most recent trip. B/c the entrance applause is MORE than deserved when it comes to that amazing, talented, stunning being!

)
"My friends have made the story of my life."
-Helen Keller