modern dance is usually performed in theatres plays ect but you can also watch at dance clesses.
Major ballet companies do not usually focus on one particular technique, such as RAD. This is only one style to keep the standard and process of assessing an individuals technique. Major ballet companies prefer rounded techniques that an individual has formed over a period of time. A style that suits their particular body shape and abilities. This may be RAD orVaganova, Chechetti and Paris Oprea styles. All of which usually demand a very high standard when being assessed at a high level (vocational level).
stick you finger up you bum!
In opera - the acting, both vocally and physical coupled with the story-line and music. In ballet - the movement, stylised and otherwise, of the dancers coupled with the music
French. That is why derriere is putting your foot behind because in French it means behind...!!