According to Netease Cloud Music, "Xiaoyun" is the lyrics of the song "Treading on the Waves". This widely circulated campus song was introduced to the mainland by the chief female singer Zhu Fengbo on 1980, and the original song was Shen Yan.
Some lyrics are: a little cloud/walk slowly/please have a rest/stop for a while/flowers bloom on the mountain/I just came to the mountain/so you are on the mountain/watching the flowers bloom on the mountain.