As we reported earlier this week, Mac Miller is about to make a splash on the Billboard 200 albums chart, as his "Blue Slide Park" debut is set to bow at No. 1 on the tally next week. Sources suggest the rapper's album could sell in the range of 160,000 to 180,000 by week's end on Sunday, Nov. 13.

If "Blue Slide" does bow atop the list, it will mark the first independently-distributed debut album to hit No. 1 since 1995, when The Dogg Pound's "Dogg Pound" started atop the list.

Mac Miller On Way to Indie History at No. 1 on Billboard 200 Chart

On SoundScan's Building chart below -- a precursor to the final Billboard 200 ranking -- reflecting the first four days (Monday through Thursday) of SoundScan's tracking week (ending Sunday) as reported by six major merchants, Miller is found at No. 1, while the new "The Twilight Saga: Breaking Dawn - Part 1" soundtrack is in the No. 2 spot.

"Dawn" may mark the fourth soundtrack in the "Twilight" series to reach the top two slots on the chart. The first two "Twilight" soundtracks hit No. 1 on the Billboard 200, while the third, "Eclipse," reached No. 2 last year. Collectively, they have shifted 4.5 million in the U.S. according to Nielsen SoundScan.

The new "Dawn" soundtrack may sell around 100,000 copies, so say industry prognosticators.

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The new "Now 40" compilation locks down the No. 3 slot on the Building Chart, and its expected to sell around 100,000. "Now 40" is available in two formats -- a standard 20 track edition as well as a 36 song version. The latter includes 16 hits from previous "Now" compilations, including Britney Spears' "Baby One More Time" and Lady Gaga's "Just Dance" featuring Colby O'Donis.

Michael Buble's "Christmas" is found at No. 4 on the Building tally, followed by Justin Bieber's "Under the Mistletoe" and Adele's still strong "21."

Aventura's Romeo Santos is at No. 7 on the Building Chart with his debut solo album, "Formula, Vol. 1," and it's projected to sell perhaps 65,000. It should easily debut at No. 1 on the Top Latin Albums chart and would secure the biggest sales week of any Latin album since way back on June 23, 2007, when Daddy Yankee's "El Cartel: the Big Boss," sold 82,000 in its first week according to Nielsen Soundscan.

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Santos' first week could be further amplified by the impact gained from his performance on Thursday's (10) Latin Grammy Awards. He sang his current No. 1 Hot Latin Songs single "Promise," with Usher. 11.1 million viewers watched all or part of the three hour Latin Grammy show on Univision.

As for the rest of the Building chart, Coldplay's "Mylo Xyloto" is No. 9 while Miranda Lambert's "Four the Record" is No. 10.