Just mashing together two iconic songs just cause you wanted to see how it sounds - and nailing it - what a musical genius.
If you've ever stumbled down a YouTube rabbit hole (like we often do), you might come across some gems that you may not have seen before - like this of the late great Chris Cornell singing Metallica 'One' lyrics over U2's 'One'.
Two very different songs - Metallica 'One' is about a man stepping on a landmine and being placed on life support, whereas U2's 'One' is the story of a break-up - but man, Cornell manages to turn it into one beautiful song, and crushes it.
Here's him telling the audience how the mash up came to be:
Honestly. This was man was so goddamn talented. We really lost a special human in 2017. RIP Chris Cornell.