I bought Kar Wai Wong's 2046 and it came with a CD soundtrack. Among the Asian artists on there, Dean Martin's "Sway", really stood out. I thought it was a cover song (which it technically is) because I know that Jennifer Connelly lipsynced to this song in Dark City.
As turns out, it was originally a mambo instrumental called "Quien Sera", written by Pablo Beltrán Ruiz in 1953. Norman Gimbel wrote the English lyrics and Dean Martin recorded this in 1954.
Bonus: Can't get enough of "Sway"? Check out this awful remix Shaft - Sway (Mucho Mambo), a standard/faithful cover Michael Buble - Sway, another awful/dancy Pussycat Dolls - Sway. I read that there is a version by Jennifer Lopez, but I'm avoiding that one at all cost.
Postscript Thank you to whoever is tagging the writers (what happens if I cover the Velvet Underground?). I also wanted to say hi to Vickie, who I haven't seen in over six years but I must've left a bad impression on her to look me up recently. Hopefully, I can peer pressure her to join us.