"A Cauldron Full of Hot, Strong Love" was a jazzy song performed by Celestina Warbeck. Arthur and Molly Weasley danced to it when they were eighteen, and, with their family, they listened to it again on Christmas 1996 on the Wizarding Wireless Network.
When Ron Weasley tried to guess the password to Potterwatch in 1998, A Cauldron Full of Hot, Strong Love was heard a few times. This indicate that it might be quite a popular song.
Lyrics
The song's lyrics include:
Oh, come and stir my cauldron
And if you do it right
I'll boil you up some hot, strong love
To keep you warm tonight