From the recording Bright Morning Stars are Rising

<p><span style="font-size: large;" data-mce-mark="1">This is a three chord tune, using the pinky to make the notes of the IV chord.... the chord built on the 4th note of the scale, and the middle finger to make the notes of the V chord, the chord built on the 5th note of the scale.</span></p>
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<p><span style="font-size: large;" data-mce-mark="1">With the open string (1) and these two tones 4 and 5, you can make all the notes of the major scale. It shows why these three chords are so important for backing music.</span></p>
<p><span style="font-size: large;"><span style="font-size: large;">Here's a link to a video of Twinkle Twinkle Little Star demonstrating the technique:&nbsp;</span></span></p>
<p><span style="font-size: large;"><span style="font-size: large;">http://www.youtube.com/watch?v=M3ey_KnaTRc</span></span></p>