People do a lot of things to stay focused while playing poker.
Like you said, while listening to music with headphones some wear earplugs and a hat and sunglasses. It all depends on the table environment you're playing in. So, it is relatively difficult to focus on the game in live poker.
온라인홀덤 is a bit free in this area because you can play it freely by lying on the sofa alone at home. You can play games with the song app on and even play while singing. When I enjoy holdem, I do it with the song turned on in the music app. I think it's more focused.