I am not sure what you really meant by "my tears have dried up" part. You meant the song changed your mood from sadness to happiness? I would translate it better if I know what you exactly say. Here's my best. "이 음악에 내 눈물이 다 말라버렸어. 고마워. 이제 나 웃을 수 있어." or "이 음악이 내 눈물을 멈추게 했어. 고마워 나 이제 웃을께"