Maybe I'm looking at it from a different perspective too,but I'd say that there's a difference between saying a coupla songs are monotonous,and saying that the arrangements are monotonous.
I said(and I think the other guy too said)that the arrangements are monotonous,in fact,get monotonous,after a while.That moving from one song to the next,there's nothing markedly different in her flow.
If someone played seven songs whose arrangements were all similar to______(your all time favourite here),that won't make the songs monotonous.But the arrangements just might be.
I'm I saying anything?