The hymn of praise sung, ideally by the deacon, before the paschal candle during the Easter Vigil. Here is a practice video for the current English translation.
Here is a recording at a lower key.
Here are two other recordings:
http://musicasacra.com/media/exsultet.mp3
http://www.npm.org/Chants/assets/exsultet.mp3
The music in modern notation.
The music in square note notation.
Exsultet in Latin, square note notation. Videos below for the Latin (in two parts).
Exsultet in Spanish, modern notation and square notes (uses a different translation).