I found a version with chords. Was it this one?

http://www.youtube.com/watch?v=yzYOW34lbXg

I would find those chords uncomfortable too. Too many C's, which I find hard, and a few F's, which I find impossible. The song is in the key of C there, and the first chord is a C chord. If you haven't done it already, write down the first verse and the chords that threelegoman uses with it.

Now, if you want to sing it higher, try the key of D, so your first chord is a D chord. If you want go lower, use the key of E and an E chord.

Here's a site that shows how to make a device which transposes the chords for you. For example, to play in D, line up C and D and it will tell you what the other chords should be.

http://www.tabbycatmusicarchives.com/00tcmwhl.htm