We've been discussing the issue in depth and one of the ideas is to noindex, follow all of the artists work. Then create collections of content on different topics, where we can talk about the subject matter.
I like this idea. Perhaps coupled with the analysis what was driving the traffic before your site got hacked - I mean, you could perhaps see which artists or their work have been searched the most and with what phrases and centre the content on these hub pages around this.
Good thing is that you could perhaps pick one or two more searched artists / type of work and create hub pages just for these, and then monitor if this increases the traffic. I would prefer this to a "big bang" approach.
Now we're getting searches for "green widgets website name" because Googlers specifically want content from our website, but cannot find it now.
I presume this is because this content existed on the old site, but is not any more on the new site since you had to rebuild it from the scratch? Where (what kind of page) these visitors land now? Do they bounce back or do they try to navigate from within the site searching for the right page? Could you perhaps analyse these searches to see which hub pages you could create to cater for these visitors?