In Path of Exile: Synthesis we're remastering the existing soundtrack of several in-game areas and also adding new music! Our composer Kamil is continuing to create a cohesive Path of Exile soundtrack, and today we're happy to share a preview of some of his new tracks!
On a side note, we know that many of you would like to be able to change the music in your hideouts. We are keen to introduce this functionality in the future and have some plans for how we would do it, but it's not part of 3.6.0.