In 1818, a burglary in the dockyard in Portsmouth prompted the British Government to announce a competition to produce a lock that could be opened only with its own key. The winner, Jeremiah Chubb, produced a product still bearing his name almost 200 years later.
It’s hard to find when the word ‘key’ came into use to describe the item that would open a lock, or indeed when it started being used in relation to the tonality of a song.
One thing’s for sure however, it’s not a coincidence that the same word is used in each case.
Find the key and you’ll unlock the song.