I think tune is ancient, along with the Exsultet (Rejoice, heavenly powers! Sing, choirs of angels!).
I was searching the internet for these today, and these are what I've found.
Many thanks to contributors at this forum (http://forums.catholic.com/showthread.php?t=484948).
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Easter Dismissal ~ Traditional Chant
Priest:
Go in the peace of Christ. Alleluia! Alleluia!
Choir:
Thanks be to God. Alleluia! Alleluia!
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Latin Gregorian Chant Version
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In English
In English
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The Mass In Ended Version (Latin & English)
The Mass In Ended Version (Latin & English)
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The Mass In Ended Version (English Only)
The Mass In Ended Version (English Only)
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