What are the differences between a fugue prelude and cadenza?

Answer:
A prelude is an instrumental piece in a free form. It is often paired with a fugue, which is a contrapuntal piece which has a theme the composer repeats throughout with modulations, it is kind of like a conversation between voices in different registers. A cadenza is a free, often improvised, opportunity for a soloist to show off his musicality and technique, often towards the end of a movement in a concerto.
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