Susan Boyle's "I Dreamed a Dream" is on course to spend a third frame atop the Billboard 200 next week, as industry sources suggest the set will sell at least another 500,000 copies and could approach 600,000 by week's end on Dec. 13.

This past week, Boyle's "Dream" held on to the No. 1 slot for a second frame with 527,000 -- down just 25% -- after bowing last week with 701,000. Now, with 1.23 million sold in its first two weeks, "Dream" is chasing after Taylor Swift's "Fearless" (2.53 million sold this year) for the title of 2009's best-selling album.

With four sales weeks left in the SoundScan tracking year, and with industry gurus suggesting "Dream" will have yet another blockbuster week, Boyle could overtake Swift's sales figure by year's end.

This wouldn't be the first time a surprise fourth quarter release rallies to overtake the seemed-to-be-certain top seller of the year.

Back in 2007, Josh Groban's "Noel" was released 12 weeks before the end of the year and blew through 3.7 million in that span of time. Two weeks before the year was over, it had overtaken the soundtrack to "High School Musical 2" (3 million) to become the year's best seller.

Two years ago this week, in the week that ended Dec. 9, 2007, "Noel" sold 582,000 copies and then scored 669,000 and 757,000 frames in the two successive weeks, respectively. All told, "Noel" earned four weeks of at least half-million in sales.

Meanwhile, on next week's Billboard 200, the highest debut will come from either the second installment of the "Glee" television soundtrack or Chris Brown's new album, "Graffiti." Currently, "Glee" is projected to sell between 110,000 and 120,000 in its first week, while Brown may shift 95,000 to 110,000. After that, it looks like the currently jailed Gucci Mane will be the next biggest bow, as his "The State Vs. Radric Davis" could break out with 90,000.

A little over a month ago, the first "Glee" soundtrack entered the chart at No. 4 with 113,000 sold copies, according to Nielsen SoundScan. As for the beleaguered Brown, his last album, "Exclusive," debuted at No. 4 in 2007 with 294,000.