The example of a gradual, or one of the responses to the reading of the epistle during the Mass, composed by Leonin is:
- The "Viderunt omnes".
- The "Viderunt omnes" is a gradual, a type of hymn or chant sung in response to the reading of the epistle during the Mass in Catholic Church.
- It has two versions: a two-part version by Leonin, and a four-part version by Perotin.
- The "Viderunt omnes" is known for its use of polyphony.
- Polyphony is a type of texture in which two lines of independent melody are played simultaneously.
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