You don't ever need a reason to listen to 'It's Raining Men' - not even Geri Halliwell could ruin that tune for us.
But since Chaka Khan performed it on Late Night with David Letterman last night, that's a good a reason as any.
The 1979 song was originally performed by The Weather Girls, but was co-written by Paul Shaffer - i.e. the band leader/musical director on Letterman.
The 62-year-old (!) Khan, incidentally, has a new album out this autumn.
Watch her perform 'It's Raining Men', backed by Shaffer, below: