I remember that it is sung by a sexy sultry female voice, with that slow zzzzzZZZIP zzzzzzZZZIP instrument going on in the background (sounds like someone running their fingers down a comb).
Any idea what the name of the song is?
Bonus if you know the name of that zzzzzzZZZZip instrument.
Seems to me like it could be “The Look of Love”, maybe? Not sure about the exact version you’re looking for, but a quick search reveals popular renditions of it by Diana Krall and Dusty Springfield. There’s also a version by Sergio Mendes & Brasil '66 - I remember this one and it may feature the instrument you mention, which by your description I’m pretty sure is a guiro.
Not only was I wrong on the rhythm, but I got the melody wrong too. The last time I heard it was on the in-flight music during a ten-hour redeye, so I wasn’t exactly in top form. I did consider asking the airline for their playlist, but I forgot.
So the zip zip instrument is properly referred to in English as a Guiro (presumably from Spanish)?
I sort of prefer the Brazilian name for it: reco-reco. It kind of imitates the sound.