Audio from one android phone to another

I have an old oneplus 6t I am using to play music as it is rooted and using Viper4Android to get better equalisation At the same time, my main phone is a galaxy fold 4 and I would like to have my earbuds connected to this phone (so if I get a call I can take on earbuds etc) but receive music from my Oneplus Anyone have any ideas or done something like this before?