prepare at least two contrasting movements 这句话的中文意思?

prepare at least two contrasting movements 这句话的中文意思?
A sonata or variations by Haydn,Mozart,Beethoven,or Schubert (for the recording,prepare at least two contrasting movements; for the live audition,prepare an entire work)
A twentieth- or twenty-first-century composition (for a multi-movement work,prepare at least two contrasting movements)
来自这两段中，我在想它的意思是不是弹一个快板乐章和一个慢板乐章。但看到后面那个近现代作品又提到了，于是就不懂了，还有这个for a multi-movement work的意思?