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A Hong Kong musical tongue twister (Chinese: 急口令) is a melody rhyme that follow a musical tune. Such tongue twisters are extremely short, and contain some addictive background music. Within Hong Kong culture, they have been classified under the heading of TV theme songs. However, they are not songs written in entirety or featured on any albums. Usually most tunes last no more than 20 seconds. The tunes are used almost exclusively for commercials.