我愿意为你唱情歌我愿意为你写情歌
[wŏ yuàn yì wéi nĭ chàng qíng gē wŏ yuàn yì wéi nĭ xiĕ qíng gē]
Translated as I am willing to sing/ write love songs for you, this directly expresses one's willingness and dedication to their partner, showing strong affection and commitment to writing and singing love songs for the other person.