by chance I hit upon this keyboard/looping genius, quite enjoyable. Two links but there is more if you like....

https://www.youtube.com/watch?v=A2DlvP4lhtI

https://www.youtube.com/watch?v=vBE8B6fyRWY

regards,
John

Loopers are very popular in today's music creation and can evolve into some very complex arrangements,...a form of multitracking that gives you a bit more freedom when recording..as you can see you wont get much reaction here among arranger players but I really enjoyed watching the process of this performer..
nice find ..

Fun stuff.
But actually, is'nt most music a kind of loop?
I.e. such as Intro, Verse, Refrain, Verse, Refrain, Bridge, Refrain and End?

Here is another way to do this:
Btw, he is Norwegian.

arrangers are just that, short smf files repetitive looping controlled by the operator..simple as that