From Wiki:
“Bei Mir Bistu Shein” (Yiddish: בײַ מיר ביסטו שיין”Ž, “To Me You’re Beautiful”) is a popular Yiddish song composed by Jacob Jacobs (lyricist) and Sholom Secunda (composer) for a 1932 Yiddish comedy musical, I Would If I Could (in Yiddish, Men Ken Lebn Nor Men Lost Nisht, “You could live, but they don’t let you”), which closed after one season at the Parkway Theatre in Brooklyn, New York City. The score for the song transcribed the Yiddish title as “Bay mir bistu sheyn”. The original Yiddish version of the song (in C minor) is a dialogue between two lovers.