It’s time to separate out this very lovely sound from similar ones in our text. Reduplicatives are very simply sounds which have been duplicated for sonorous effect. I call my dog “Sgiob-Sgiob” when I suddenly need two syllables to make a minor-third calling sound. We hear it a lot used with children learning to speak, as well.
The roll-roll-roll repetition here both suits the syllables to the beat of the work song and to mimic the sound of the action described thereby.
• 09.049 roll-roll-rolling down the hole!