I agree with @Billiam about the reduction in the dispersion of the percentages. There's a certainly a great deal more that could be done with the data - from adjusting songs by debut to, to adjusting by tour length, to even discounting some shows. (I kept them all in.)

And @NoHayBanda is right, to an extent, both that the actual variability in songs affects the input to Trey's Notebook, and that the precision of the predictions (how many songs are listed) affects the output. But actual variability should impair the predictions, which might actually do a better job if that were considered; and higher or lower precision would alter the percentages but might not appreciably changes *in* those percentages, which is what I was after.