Just soothing music! It’s best if there are no lyrics, or if there are, it’s better if you don’t understand them. If there are lyrics your brain will process the information. It’s hard to concentrate when reading!

When listening to music, the brain automatically processes music information, and also keeps the brain active during intervals of reading or thinking to improve reaction speed and efficiency.

But music with loud sound, strong rhythm, and understandable lyrics takes up the brain's response resources.

Just like a computer. When a program is running, the hard disk is active. If there is no hard disk, it will slow down or stop! Suddenly start a big program. The reaction speed when active is of course faster than when stationary!

Don’t overdo it, read books and listen to music. If the music is mainly reading, the sound should be lower, and if the music is the main content of the book, don't be too deep.