Canone inverso.

LISTEN TO THIS:
www.youtube.com/watch?v=Z-V1mJXe9-Q
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In music, a canon is a contrapuntal (counterpoint-based) compositional technique that employs a melody with one or more imitations of the melody played after a given duration (e.g., quarter rest, one measure, etc.). The initial melody is called the leader (or dux), while the imitative melody, which is played in a different voice, is called the follower (or comes). The follower must imitate the leader, either as an exact replication of its rhythms and intervals or some transformation thereof. en.wikipedia.org/wiki/Canon_(music)