How Little We Know - wikipedia How Little We Know `` How Little We Know '' is a song written by written by Hoagy Carmichael and Johnny Mercer for the 1944 film To Have and Have Not, where it is performed by the character `` Slim '' played by Lauren Bacall. A young Andy Williams recorded the song for the film as a possible alternative track to dub Bacall 's low voice. Bacall said they used her singing. After the film 's release it was a hit recording sung by Judy Johnson. It has been covered periodically, most recently in 1999 by Michael Feinstein with the Maynard Ferguson Big Band. References Jump up ^ `` When Andy Williams dubbed Lauren Bacall ''. latimes. Jump up ^ Hoagy Carmichael. `` Cover versions of How Little We Know by Betty Jane Bonney - SecondHandSongs ''. secondhandsongs.com. Retrieved from `` https://en.wikipedia.org/w/index.php?title=How_Little_We_Know&oldid=757580966 '' Categories : 1944 songs Songs written for films Songs with music by Hoagy Carmichael Songs with lyrics by Johnny Mercer Talk About Wikipedia Add links This page was last edited on 31 December 2016, at 14 : 01. Text is available under the Creative Commons Attribution - ShareAlike License ; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia ® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. About Wikipedia

Question: who sang for lauren bacall in to have and have not
Answer: Judy Johnson