Oboe. According to Query Music Network, "Flowers and Boys" is an orchestral piece. The second theme is played by the oboe, which expresses the liveliness and vitality of young people. Created in 1956 by Wang Xilin. Taking the Qinghai folk song "Hua'er and Boy" as the theme, by using different musical instruments and arrangement techniques, it shows the characters and emotional changes of Hua'er and Boy at different ages.