And it is excellent.
It’s also proving to be rather popular with over 125,000 views and counting.
The original tune hummed by the outgoing PM on Monday has also been analysed by classical music buffs.
Seemingly not realising he was still wearing a microphone, he hummed to himself: “Do do do”.
When he walked through the door, he said: “Right, good. “ This was followed by the sound of his microphone being frantically removed.
And the classical buff verdict?