קלי אתא-You Are My God

Transliteration:

Kieli atah ve'odekah eloikai aromimekah.

Translation:

You are my G-d and I will give thanks to You; You are my G-d and I will exalt You.

The above video is of a yeshiva student performing the nigun in his dorm room.  

There are several renditions of this nigun, and because the nigun comes from such a deep part of the soul, you can feel the difference from each person singing.  

Here are several more versions

Avraham Fried  

Boris Savchuk 

This nigun is sung by Chabad Chasidim during Hallel prayers at the beginning of each new month and on holidays as well as sung by the pouring of the Cup of Elijah at the Passover Seder.