Classic refers to the zodiac of cattle, which belongs to cattle: old-fashioned. Cattle people are old-fashioned and will not change themselves easily. What they used to look like is what they look like now. So the songs that belonged to the cattle people 20 years ago will be listened to now. Anyway, listening to music is not following the crowd, as long as you are happy. Therefore, people who belong to cattle have always maintained the habit of listening to old songs and slowly passed on the classic old songs.