Talk:Just Dance 2018/@comment-33053950-20171013094617/@comment-32332997-20171014231133

It's a matter of rights. The rights are different for including a song in the base game or as DLC. For JDN/JDU, they also need to have streaming rights to the songs. Starting with JD2016, they began buying both kinds of rights at the same time for most songs, so that's why nearly all of 2016 and 2017 are on JDN/JDU.

For the songs from JD2015 and earlier that are not on JDN/JDU yet, they have to go back and buy the rights to the songs again to be able to add them, which will cost them a lot more money.