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Thanks for your answer, 

I didn't think a choreography was necessary for a song, my bad. 

That's good to know.

Maybe you could include some basic information at the start of the game (nothing as big as a tutoriel)

Another question, is there a way to know how many contracts an idol possess at any moment ? If not, a right click which give the option to see an idol contracts information would be nice and a great help.

You can see all contracts if you click on your producer and click Contracts in the menu

Also, when you hover mouse over an idol, there should be a tooltip with some info, including the number of contracts. (you might need to right click to display a different type of tooltip)

And in the next update I’m planning to add idol profile pages, you’ll see her contracts there too