News broke on Monday morning that one of music's biggest names, David Bowie, died aged 69 after an 18-month battle with cancer.
The Londoner is widely regarded to be one of the most influential musicians ever to grace our planet. He was a star, and now he's a legend.
Yet, despite his success and fame - selling around 140 million albums over his career, according to the BBC - there are people who are asking who he is.
Thousands have been paying tribute on Twitter. But some have been left a little confused.
It's perplexing. And upsetting. Where have they all been?
Oh god. It's happening. 'Who is David Bowie?' pic.twitter.com/LjnHTKiFrn— David Wyllie (@journodave) January 11, 2016
The fact that I don't know who is David Bowie :(— Joanna (@OlJoannaO) January 11, 2016
Who is David Bowie, I've heard of him but don't have a clue as to what he does— Rick Grimes (@Cazorllerin) January 11, 2016
Who is David Bowie? Did I miss something?— Richard Crump (@IskaralCrump) January 11, 2016
Me: david bowie died Tarik: squints Tarik: who is that— camille (@chemicalwrld) January 11, 2016
Who is David Bowie— andy (@andyywhitee) January 11, 2016