On the comment by Rich(bodhránai gan ciall) two of anything can be confusing. I heard two Ullean pipers playing with one a semi, demi femot quaver behind the other. Their skill was unquestioned, and they were strangers but enjoyed each others' playing.
The problem for me was when I moved seats, behind the lagging player was not a problem, but hearing one in each ear was total confusion. Which to follow? When were they going into games mode?
They had played all day, I not long arrived - their session, they were avoiding repetion/boredom - their call. My frustration. Time to move on?
And as for meldoen players' games - well!!!
Now where did I put my spoons? Bones? Shaky egg? Digeredoo - that will please them.