The certified sales percentage varies according to the first year that an artist appeared in the charts.The claimed figures are referenced from online articles created by highly reliable sources.In other words, the available certified sales for each artist should get relatively closer to already listed claimed figure in order for higher figures to replace the listed ones.

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That is why Cliff Richard, Diana Ross, Scorpions, Charles Aznavour, Bing Crosby, Gloria Estefan, Deep Purple, Iron Maiden, Tom Jones, The Jackson 5, Dionne Warwick, the Spice Girls, Luciano Pavarotti, Dolly Parton, Ozzy Osbourne, Andrea Bocelli and others have not been included on this list.

The more recent the artist, the higher the required percentage of certified units, so artists such as Rihanna, Taylor Swift, Flo Rida, Katy Perry, Justin Bieber, Adele, Lady Gaga, Bruno Mars and Nicki Minaj are expected to have their claimed figures supported by over 75% in certified units.

If two or more artists have the same claimed sales, they are then ranked by certified units.

The claimed sales figure and the total of certified units (for each country) within the provided sources include sales of albums, singles, compilation-albums, music videos as well as downloads of singles and full-length albums.

For clarity, the sources used, say the term "records" (singles, albums, videos) and not "albums".

However, if all available sources for an artist or band say "albums", such sources are only used if the certified album units of the said artist meet the required percentage amount.

Record companies often apply for certifications only when a record reaches a multiple certification-levels, meaning certifications might not be visible in the databases for more than a short period of time after an album reached a certification level.

Artists have been announced for this weekend's Leeton Country Roundup.

This is because Recording Industry Association of America and almost all other certifying bodies count streaming towards Gold and Platinum thresholds required for Digital Single Award certification.