I asked the whole question in the title.
At this point all you can do is set an ambient sound track, so the second.
Yeah, next time put a summary in the title, and the question in the description.
The music playlist you select only plays for the host, and cannot be switched currently.
Unfortunately, no. Unless they add it soon. Maybe make a suggestion or find one that someone else has made. Gimkit Feedback (nolt.io)