I came here to say exactly this. Once I got tired of sad music, my brain was tired of being sad. I could gradually improve my mood by shifting the music I was l

I came here to say exactly this. Once I got tired of sad music, my brain was tired of being sad. I could gradually improve my mood by shifting the music I was listening to. Fascinating that I'm not the only one who does this. This must be a thing. Thankfully I only deal with depression occasionally now, but this trick worked great for me.