What is the song of picking a Gesang flower?

Walk the world together. According to the song "Go to Tianya Together", the lyrics "Love me, have a cup of butter tea with me, love me, pick a Gesang flower with me and go to Tianya with our love" contain this sentence, so it comes from the song "Go to Tianya Together" sung by Hua Shao/Tang Wei, a fan.