This song is called "Who Will Sing for Me?". It's been recorded by a lot of people, but it seems like the archetypal recording was by Flatt & Scruggs. The same arrangement is played on the album, "The Three Pickers". The key is Bb--I used G, capo 3. (Sorry, fiddlers and mandos.)
The structure of the song goes like this:
Intro: G G C G G G A7 D G (G)
Verse: G G C G G G A7 D G
Chorus: D G D G G C … G D G
And this pattern is repeated three times. These chords are, of course, relative to the capo.
There is a pause after the C in the chorus. In the Flatt & Scruggs recording, they break time there and pause for a while. I didn't pause as long--I hit the chord and let it ring for the rest of the measure, then came back in. I figured that would be more useful for practicing, since the mp3 can't give you the visual cues that another player would about when to come back in.
This tune has a cool guitar part that Earl Scruggs plays fingerstyle. It reminds me a bit of "Give Me the Roses". I haven't learned how to play it like Earl does, I just kinda approximate it.
I recorded a demonstration of the tune with vocals and fills so you could hear it if it's new to you. The 3 Pickers version is cool, check that one out. The performance tempo is about 185 bpm, so I recorded at tempos on both sides of that.