Broken Strings by Sara Creasy is book 9 of the Wynter Wild series. It was available on Wattpad in 2020.
Books in the Wynter Wild series:
02 Out of Tune
08 Minor Key
09 Broken Strings
Wynter and her brothers have a challenging time ahead, and hopefully a rewarding one. Their music careers move to the next level and they'll have tough decisions to make as they work out their priorities.
Wynter has a new bestie (well, it's her first bestie) and her eye on setting up Jesse. Meanwhile, Xay has an opportunity to chase after his dream, and Caleb and Indio each have someone special to take care of.
But nothing good lasts forever. When the strings break, this family needs to find a way to pull together.