Jay-Z, Kanye West Respond to Syl Johnson's Lawsuit
Jay-Z, Kanye West Respond to Syl Johnson's Lawsuit

The big numbers for Jay-Z and Kanye West's "Watch the Throne" keep rolling in.

The set is already on track to sell more than a half-million copies in its first week, sources say, and now, it's likely to shatter the one-week iTunes Store U.S. album download record too.

"Throne," which is exclusively available via iTunes until Friday, Aug. 12, seems to be on course to break iTunes' one-week sales record, set when Coldplay's 2008 album "Viva La Vida Or Death and All His Friends" shifted 282,000 in its first week. (The album sold 288,000 total downloads in its first week, including sales from all other retailers.)

Kanye West and Jay-Z's 'Watch the Throne' Hits iTunes, Avoiding Leak; Deluxe Details Revealed

Sources told Billboard.biz that "Watch" sold more than 155,000 downloads via iTunes on its first day of release. That 155,000 figure comes close to the one-day iTunes sales record, which was tallied by "Viva." Sources say "Viva" did around 175,000 on its first day in the iTunes Store.

"Watch" will not, however, earn the record for the biggest overall digital sales week ever for an album. That distinction is held by Lady Gaga's "Born This Way," which moved 662,000 downloads in its first week earlier this year, with the bulk of those sales courtesy of AmazonMP3. The retailer famously priced the album at 99 cents for two days during its opening week. It's estimated that Amazon sold upwards of 440,000 downloads of its 99-cent "Born This Way" album.

Jay-Z and Kanye West's 'Watch the Throne' Exclusives Have Retailers Up in Arms

Of course, Amazon could always opt to sell "Watch" for an ultra-low sale price, as it did with "Born This Way," once it begins offering the set on Friday, thus throwing a wrench into the album's first-week sales projections. Stay tuned...