To IEM usere, Which app do you use for music streaming?

After lurking through this forum, I have decided to give IEMs a try. But to get the best result, i believe I also need a good audio streaming app as well. I primarily used Youtube. Sometimes Youtube Music. I use revanced versions of them, so they are free. (Perks of being an Android user)

Would these work as well or do you use any other apps? I'd prefer to use free apps tbh. But please drop which apps do you use as well.

Regarding IEM, I am thinking of going with Red Lion. I heard it's good for beginners and a bang for buck. Do recommend other IEMs too.