Respuesta :
The title refers to Jing-Mei’s epiphany about mother-daughter relationships. Jing-mei remembers two different songs, when in fact they are part of the same song. The song is a metaphor for childhood, because we are sometimes content and sometimes pleading, and childhood is about balance.
The answer is:
The "Two kinds" are two kinds of daughters. One is obedient, and the other is not. These two pieces of piano are part of the same song. When young, Jing-mei acted as a "Pleading Child" begging for the approval of her mother. When the daughter became an adult, she became "perfectly contended" and pleased with what she is.
Hope it helps!