电影卡萨布兰卡里的歌曲和歌词是什么？

(One night, Laszlo and Ilsa go into Rick's café. Ilsa finds that the black playing the piano is Sam and goes to greet him.)

　　Ilsa: Hello Sam.

　　Sam: Hello Miss Ilsa. I never expected to see you again.

　　Ilsa: It's been a long time.

　　Sam: Yes ma'am.

　　Ilsa: Where is Rick?

　　Sam: I don't know. I ain't see him all night.

　　Ilsa: When will he be back?

　　Sam: Not tonight no more. He ain't come…um, he went home.

　　Ilsa: Does he always leave so early?

　　Sam: Oh he never…well, he's got a girl up at the Blue Parrot. He goes up there all the time.

　　Ilsa: You used to be a much better liar. Sam.

　　Sam: Leave him alone, Miss Ilsa, you're bad luck to him.

　　Ilsa: Play it once Sam, for old time's sake.

　　Sam: I don't know what you mean, Miss Ilsa.

　　Ilsa: Play it Sam. Play "As Time Goes B