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Greece is a very bad example. Greeks have more R1b than R1a and they're predominately E and J2 folks. R1a is only at the 5th place in their DNA haplogroup distribution, after J2, E, R1b and I.
Exactly. It's widely accepted that the Bell-Beaker culture was a proto-Celtic one. So I think that they were predominately R1b folks. I've got this from wiki: “However Bell Beakers have now been radiocarbon dated to 2900 to 1800/1700 BC, which would make them contemporary with Corded Ware.”
They moved northwards into the land of the Corded Ware culture folks, and I think that the Corded Ware culture (R1a) had links with the 'Kurgan' cultures (R1a) in the northern Caucasus area.
So Bell-Beaker folks lived at the same time as Corded Ware folks. Maybe that was the time when the admixture emerged. I think that Aryan Satem speaking tribes related to Kurgan were in Germany before the Celtic tribes, but got eventually 'replaced' by them after the proto-Celts (R1b) moved northwards.
Or maybe they met each other in Germany when one group moved into Germany from the east and other group moved into Germany from the southwest...