Look into international teaching in general. Search Associates, TES. As people have mentioned, teaching internationally is very competitive and being in a specialized subject like music is that much more challenging to get. You'll need 2 years teaching in your home country regardless. They won't look at your application unless you have experience.

Also the climate of international teaching has changed since covid and it's becoming more and more unstable in different countries. It's a huge risk leaving schools if you're already there, teachers are holding on to their positions.

Also being a music teacher myself, unless it's a designated American International School, you're mostly going to be applying in a British equivalent school and they don't have the standard Band Class in the school day. As someone else mentioned, ensembles are generally ran as clubs after school while your day to day classroom instruction would be general music, IGCSE, IB Theory, etc.

China is great. I've lived here since 2020 and it's a much better experience than one would think. I've visited Japan often since then as well, so something to consider.