The most difficult thing in music appreciation is untitled music style. It contains no hints and is entirely up to the listener to understand. For example, Tchaikovsky's most famous "Symphony No. 6" is full of tragedy. Although there are occasional joyful and majestic fragments, the atmosphere of grief, sorrow, fantasy and death envelopes the whole song, especially the first and second symphonies. The four movements are like a "Requiem", with sad sobs and desperate moans that can make people cry, so later generations called it the "Pathétique Symphony". Listening to this type of music is mainly to stimulate emotional excitement, to feel sad when listening to sad sounds, and to rejoice when hearing happy sounds.