e.g. He strummed the riff of a popular song on the guitar.
e.g. She opened her stand-up comedy routine with a riff on life in New York City.
e.g. The movie offers a riff on the familiar Romeo and Juliet story.
e.g. The lead guitarist of the band began to riff their most famous song.
e.g. He likes to riff on the odd things he encounters at his job.
e.g. She just had time to riff the outline of the presentation.
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