Watch the Mary's Lamb: Version 2 online guitar lesson by Pete Huttlinger from The Lone Arranger

Now I'm going to explain what is going on with the descending line,
explanation of the chords as they pass by. Notice how the C#, C etc have to be on the third string.
Then notice the bass notes. It's all over a Pedal D note and that adds some great tension as well as
release notes.