Imagine a digital juke box that is fully decentralized where people pay to play music and the owners of songs make money.
How it works is this: The blockchain tracks the hash of every song, the length of every song, and how much money has been put on that song. The song with the most money per second of length is played next and then the balance is reset to 0. The blockchain arranges so that 50 minutes of music is played per hour leaving 10 minutes available for custom radio stations to provide their own content and earn income necessary to broadcast the music. Individuals can attach a dedication to the song provided they were the largest single contributor.
Now artists can issue an IPO on the block chain for each song they write. They initially own 100% of the song, but may sell shares in their song to raise money to support their music. Fans can then literally buy the music and own a cut of it just like owning shares in a record label. Any time money is spent to bump the song in the playlist 50% of the money is used to purchase shares in the song from the market (on blockchain)... these shares are then held for ever, taking them off the market and effectively paying a dividend to all remaining share holders in the song.
Anyone who attempts to publish work copyrighted by others (ie: not licensed to the DAC) would find that no one would buy shares in that particular song as the proceeds would clearly be going to someone illegitimate. Radio stations would then be able to blacklist songs which would be illegal for them to play. As a result, if a Beatles song were attempted to be listed without permission of the Beatles copyright owners then it would never play on radio stations, few people would bid it up on the jukebox yielding low dividends and it would be unlikely to ever play, and if it ever did make it to the top of the queue it would be replaced with an Ad by the broadcaster.
In other words, this DAC can promote the development and distribution of music while cutting out the RIAA.
This same model can be used to create TV channels and news aggregators or any content system.
There can even be many Radio DACs, one for Country Music, Rap, Classical, Talk Radio, etc...
It gets really interesting when advertisers have to compete with fans for air time. An advertiser could create an ad, and then bid it up like it was a song. This actually creates incentives for people who want more music to outbid Ads and of course any Ads listed would have to be in the public domain or they would get black-listed like other copyrighted works and thus not aired on any radio stations. In fact, advertisers would want people to invest in their Ads if they are a fan of the product.
The value of this DAC depends upon broadcasters being willing to broadcast the playlist and honor the social contract as well as listeners to listen to the songs as they are bid up. Of course, fans, song writers, and music lovers have incentive to agree to this social contract as everyone benefits: fans get to hear new music AND make money on the good stuff, song writers get an audience and a fair shot, and broadcasters get free content, an audience, and an opportunity to sell Ads.