What is drill music and where did it come from?
DRILL music is a form of trap music that first originated in the South Side of Chicago.
The style is a prominent part of hip-hop and can be recognised by its violent, dark lyrical content.
What is drill music?
Drill music focuses on crime and the daily ordeals of life on the streets.
And the word itself is street slang for the use of automatic weapons.
The beat tends to be of a slow tempo - usually 60 or 70 beats per minute.
The rapping style isn't concerned with metaphors or punchlines and often has a very deadpan delivery.
One of the main players in the musical movement is Chicago's Chief Keef who explained that his simplistic lyrics and delivery are intentional: "I know what I'm doing.
"I mastered it. And I don't even really use metaphors or punchlines.
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"'Cause I don't have to. But I could. ... I think that's doing too much.
"I'd rather just say what's going on right now. ... I don't really like metaphors or punchlines like that."
The wrote a profile on the genre's focus in 2019 on violence, saying the music is unmediated and raw and without bright spots, focused on anger and violence.
The publication said: "The instinct is to call this tough, unforgiving and concrete-hard music joyless, but in truth, it’s exuberant in its darkness.
"Most of its practitioners are young and coming into their creative own against a backdrop of outrageous violence in Chicago, particularly among young people
"That their music is a symphony of ill-tempered threats shouldn’t be a surprise."
Where did drill music come from?
The rapping style came from the Woodlawn neighbourhood of Dro City.
It was developed in the crime-riddled South Side of Chicago.
The UK counterpart of drill music originated in Brixton and rose to prominence in 2014.
It emulates the Chicago drill scene with its focus on violence, money and criminal lifestyles.
UK drill videos on YouTube can rack up hundreds of thousands of views, and for some artists, the music can make them a fortune.
Which rappers perform drill music
Drill pioneer Chief Keef, 22, signed a $6million record deal (£4.4m) at the age of 16, having written and produced his own music while under house arrest as a teenager.
Since then, he's worked with mainstream figures like Kanye West and started his own record label, earning enough money from drill music that he was able to announce his "retirement" aged 20.
Meanwhile, Lil Durk, 25, rose from the Chicago drill scene to make music with big names like French Montana and Meek Mill, going on to found his own record label and form his own drill crew.
Keef's debut single, I Don't Like (featuring fellow drill star Lil Reese) has lyrics like: "Pistol toting and I'm shooting on sight... Got your bitch, I was in it all night".
Amateur tracks on the London drill scene are considered more explicit, delivered without humour by intimating men with masked faces.
But one of the UK's most famous drill artists, Headie One, said suggestions that their genre's glorification of violence is linked to real crime is false.
He told : "Only a fool would say that drill music is the root of the problem of violence in the capital,"
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