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In Prokofiev's Peter and the Wolf, the grandfather character is always represented by a particular melody played on the bassoon, which is an example of this.
What is leitmotif?
Leitmotif is a concept coined by Wagner who used musical themes to represent specific characters in his operas. A chorus may repeat, but it is not usually linked with a particular character. Likewise, variations on a theme concern musical structure and not character development.