A market place for gig tickets, with open data for artists.
That's it.
Embrace touts, allow resale, reduce fraud (counterfeit tickets)... by making tickets ephemeral, transferable, verifiable. At this point all you've got is a more legit version of what happens in the real world.
The data part... give artists and their promoters full access. The benefit is that it removes a huge part of uncertainty for the artsists and their management. They can now more accurately predict total ticket sales, comparable ticket sales, see ticket sales across other acts in the same city on the same night, etc... meaning they get to do two things: 1) They choose more appropriately sized venues (which makes the event more vibrant as it's fuller - a fuller venue makes better margins as the fixed opex is spread over higher revenue - less lost revenue too as more fans get to see a band and less money left on the table), and 2) They get to set the price of a ticket more accurately to what the market can bear (which means they get more of the ticket value and touts get less, so the artists come out better and more realistic pricing will make a better end-to-end experience for music fans).
The data part is so valuable for filling small and medium venues that it can start to break the stranglehold Ticketmaster have on venues. The tenure of most promoters is around a decade, and Ticketmaster exclusivity deals with major venues come up within a similar time period. By building a grass roots effective ticketing system built on data you have a 10 year bet on knocking out the incumbent if you can keep the promoters and artists on your side as you and they grow. The Ticketmaster stranglehold isn't impenetrable, they have venue agreements with large traditional venues - but there are a lot of alternative venues whose seat you can fill easily, i.e. theatres and cinemas.
Within a single "generation" of music (less than a decade), you should be able to take the majority of small and medium venues, most festivals, and have serious inroads into the territory of Ticketmaster.
Are there things like this? Not really. Sure things like Dice in the UK for clubbing does the resell tickets, etc as a full and complete part of the original ticketing experience, but I do not know of a single company that is really creating anything like an open and transparent dataset that the participating artists and promoters can use without fee. Songkick were going to be my bet on who could do this, but once they went down the Ticketmaster affiliate route I no longer believe this is possible.