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Did you mean "Kol Nidrei"? I played the Bruch version of this on string bass back in college when I was a bass major.

Here is a free arrangement on the internet for treble voice and piano. Hopefully it is the melody you are looking for.

IMSLP also has that version that I played on bass all those years ago (well, cello and piano...it's the same key, though). Nice stuff!

I believe your friend is thinking of this tune:
http://www.youtube.com/watch?v=dvWxoYULWrw" target="_blank" target="_blank

best known (?) to classical musicians from Max Bruch's version for cello and orchestra:
http://en.wikipedia.org/wiki/Kol_Nidrei_(Bruch" target="_blank" target="_blank)

adapted for tuba by Dr. Jeff Funderburk:
http://www.uni.edu/drfun/FunderburkIndex.html" target="_blank" target="_blank

I don't know much about it other than it is a beautiful song that appeared on my professor's most recent recital program, but those leads should be google-able to get the information you need.