Hard question to comprehend! Not sure about what was asked but I'll give it a try.
What bands usually wear, there is no such thing. Each of the great bands had their own thing. In the 60's and 70's there was the Hippie influence, in the 80's the modern age, leather and tights, 90's hell break loose and everyone started wearing the ugliest thing they could get their hands, feet and heads on! Axl from Guns'n'Roses is a great example. Although I love Guns, I hate Axl's style.
Percent of people engaged in rock music??? Not sure anyone can answer that!
About the rest, their attitude depended on their style, with some artists. While most of them are one person on stage and in front of cameras, they were completely different in their private life. After all, it's all show business. There are only a few genuine articles.
The way they talk, well depending on the part of the world they are from, I think it's quite easy to say that a guy from London will have a British accent. If we talked about rap music than the way they talked could be a topic, rock music...don't think so!
I hope this clears something up for you :)