Hi IOU for a week of the band's time - t he band is promising one week of their time. whenever he needed us - basically on demand he could use that to get other people involved - the fact that this band is involved may encourage other acts to get involved too. As far as I know an IOU is a document acknowledging debt - correct.
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optilang.
Here IOU refers to time owed rather than money.
Now I see. Thank you!!!