How do you intend to provide liquidity? Liquidity is always a big problem for Waves. I hope you have a plan.
If you mean by liquidity, actually having a monetary value for the tokens? One way is to not release a lot of the main supply at once, but instead to those interested in ProgRock and can prove they are. They will get airdrops by doing certain things related to Progressive Music. Since a large part of the coins will be in their hands, they can trade them, and get fans aware of the token so some people can actually buy them.
I don't know much about ICO's and the like but I gather once the team is built and this looks like a real and fun project, maybe even some well known progressive rock people might get involved, we can do an ICO to give the coin a price. I don't doubt this can happen at all.
Maybe we can also have bands offer items for ProgRock tokens, or have dj's sponsor giveaways, like on a Prog Rock online radio show which there are many.