Going back even farther: Since the Billboard 200 started publishing on a regular weekly basis in 1956, "Frozen" is one of only 15 soundtracks to spend at least 11 weeks atop the chart.
"Frozen" also surpasses "The Lion King" (with 10 weeks at No. 1) as the longest-running No. 1 soundtrack by an animated film.
Sales for "Frozen" in the week ending April 20 were powered by Easter shopping, which tends to lift sales of music that appeals to families and children. Thus, there are a number of titles on the chart that reap the benefits of holiday-related purchases. One Direction's "Midnight Memories," for example, climbs 55-38 (9,000; up 68 percent), and the "Kidz Bop 25" album rises 42-20 (15,000; up 126 percent).
Speaking of One Direction, "Frozen" is the first album since "Midnight Memories" to score five straight weeks of sales that exceed 100,000. The first five sales frames for "Midnight Memories" all surpassed that threshold, but that came to a halt during the week ending Dec. 29.
But what makes "Frozen" stand apart from "Midnight Memories" - and most other No. 1 albums - is that the soundtrack has achieved such a hot sales run so long after its release. The album arrived Nov. 26, 2013 and sold 44,000 copies in its first week (ending Dec. 1). It didn't begin its current five-in-a-row streak of 100,000-plus sales frames until the week ending March 23.
It's rare for an album to spend this much time at No. 1, and when one does, it rarely earns its best sales week months after its debut. The closest comparable SoundScan-era feat was when Adele's "21" clocked its best sales frame in its 21st week at No. 1 (730,000 in the week ending Feb. 19, 2012). Its monster week was generated by Adele's multiple wins (and performance) at that year's Grammy Awards, which took place Feb. 12.
"Frozen" is more than 190,000 copies ahead of the No. 2 set this week, the debuting "Testimony" from August Alsina that starts with 67,000. It's the singer's first album, which also starts at No. 1 on Top R&B/Hip-Hop Albums.
As for the future of "Frozen"'s sales, it seems unlikely that it will notch a larger sales week. Still, industry forecasters say a 12th week at No. 1 seems like a lock. Next week's highest debut will likely be Iggy Azalea's "The New Classic," with around 50,000 copies sold. While it will be a nice arrival for Azalea, it won't be much of a challenge to "Frozen" for No. 1.