OLiS
OLiS is the official chart of the highest selling music albums in Poland. The chart exists since 23 October 2000 and is provided by ZPAV.
This is a chart of best selling music albums in the Polish media market, involving 50 matches. This overview is based on data from 233 points of sale: 227 stores of the largest retail chains in Poland: Empik, Real, Media Markt and Saturn, two of the largest Polish internet stores: Merlin.pl, Rockserwis.pl and 4 retail stores. Taylor Nelson Sofres collects and compiles the information about selling.List of number-one albums
