"Thoughts and Thoughts". "Daylong Thoughts" is a song sung by Tang Gu, with lyrics written by Ma Shuangyun and music composed by Tianhao. It was officially released by Tang Gu Music Studio on March 14, 2019. Excerpt from the song: I always think about you day and night, I feel depressed like crazy, I wait for you so infatuated that I burst into tears, I have made a promise to fall in love with my heart.