Um. When I was a kid, I performed in Shakespearean plays, with a youth company. The plays always had songs attached, whether they were included in the script or not - it was a tradition to sing one as a company, after final bows. There was one which always struck me as odd, though - "La Prima Vez", for Romeo and Juliet.
My Google-fu tells me that it's in "Judeo-Spanish" - is that the Sephardic equivalent of Yiddish? And if so... is that as bizarre of a language for a Shakespearean play as it sounds to me? The meaning fits, but I can't imagine that a Jewish, Spanish song, circa 1600, would have flown very well.