A few thoughts. As a digital currency, i think we should first start looking at digital products. Its very tempting to think of using a currency on tangible real goods, but as an old midwest saying "thats putting the wagon in front of the horse" meaning lets not get a head of ourselves.
As far as digital goods, well, musicians and music lovers both love music so using $indie to purchase music direct from a musician is a grand idea. But what else could be do with it? Could a musician give an online radio station $indie to slot them into their rotation? Should that be a route the currency takes? Could someone release some audio software for free, and you can tip $indie or maybe download some efx patches to use on the free software with $indie?
what about music listeners? The problem with "music listeners" to me is they are MUCH more diverse than musicians. Musicians share a lot of characteristics, but listeners could be literally anyone. So what would they want? Well, exchangable valure on exchanges for one, sure. That would work. What else though? Tipping musicians on a broad scale maybe?
There are just rambling and thoughts.
This is good @amphlux , getting the ball rolling. With more redeem options a value gets established. And the answer to most of your middle questions is yes, as long as the venue will accept them!