Just Dance Unlimited is a subscription-based service for accessing a streaming library of songs from previous Just Dance games, and new songs that are exclusive to the service. A three-month subscription to Just Dance Unlimited is included as part of the game. All exclusive tracks (except tracks restricted to only Just Dance 2018 for the time being) are also playable on Just Dance 2016 and Just Dance 2017's Just Dance Unlimited. The 2018 game supports Just Dance Unlimited on PlayStation 4, Xbox One, Wii U, and Nintendo Switch.
Answer this question, making sure that the answer is supposed by the text: can you add songs to just dance 2018?
yes