[Glenn Peoples, writing for Billboard][link]:
>On Wednesday, one day after the price increase, the iTunes Top 100 chart had 40 songs priced at $1.29 and 60 with the original $0.99 price point. The $1.29 songs lost an average of 5.3 places on the chart while the $0.99 songs gained an average of 2.5 chart positions.
[link]: http://www.billboard.biz/bbbiz/content_display/industry/e3i7917210cb575a9b91b4543e3d671922a “iTunes Price Changes Hurt Some Rankings”