I have had a song called Rock Power on sale for royalty rights. The idea of auctioning off rights is not new. Michael Jackson as we know bought the rights to the Beatles. I use something called Hit Song Science to determine a songs worth. It is called the Music Universe and it uses a computer program, and tells you if song is a hit. They are called uplaya.com. I have received many high ratings. Four platinum and 1 gold award. I cannot tell you how to write a hit song. You should just write and let the elves do the rest grunt work. It is like slam poetry and just write and let the judges decide if your a winner.
My song auction I have found on the internet. People buy into these things. There is eBay and other sites. Music is an intellectual property, and there is no sites specifically for music. There is the Royalty Exchange and they also sell music, but other stuff as well.
The uplaya. website is my favourite. There is Sound out too. I have used them to critique my winners from uplaya. There are some songs that I wrote and I thought were instant classic, like Camels. There are songs I wrote, that I thought were classic and did not receive a good rating at all. The Time Machine, for example. I thought this was my greatest hit yet, and it received my lowest rating yet. That is the thing, if a song is too original, it may not get compared the hits of past.
Some ideas of original music that would not garner a high rating at first and become classic are Love will Tear us Apart by Joy Division. In the past there was only usually one hit per album. McCartney was famous fro this. I think of only two hits by Joni Mitchel, - Both Sides Now, and Taxi. People like Dylan and Neil Young are still producing masterpieces.
Now with the internet and tools like social Media, we can write our stuff and get new ways to reinvent and get instant clarification of a songs value.