听过的都成为了回忆走过的都变成了曾经
[tīng guò de dōu chéng wéi le huí yì zŏu guò de dōu biàn chéng le céng jīng]
'What was listened to all became memories, where I've walked has turned into the past' - Conveying deep nostalgia over time passed and places experienced, evoking melancholic emotions while cherishing old times.