求一首歌，急急。小弟英文不好，歌曲的开头是得赛扣赛········i let you down``down ``down

歌名：Sweet but Psycho

歌词：

Oh, she's sweet but a psycho

A little bit psycho

At night she screamin'

"I'm-ma-ma-ma out ma mind"

psycho 英[?sa?k?] 美[?sa?ko?]