STACKING UP SALES

Total album and single sales of CDs and cassettes for the week ended Jan. 30, compared to week-ago and year-ago levels, in millions of units sold:

Latest week:

Albums: 9.3

Singles: 1.6

Week-ago:

Albums: 9.0

Singles: 1.4

Year-ago:

Albums: 9.1

Singles: 1.6

Atop the Charts

Monthly record company market share as of December, based on units sold. This is an indicator of music company performance.