Elysa Gardner

@elysagardner, USA TODAY

Pop has a new queen — with a familiar ice queen right behind her.

Singer/songwriter Sia (seen here with her face obscured) has for the first time landed atop the Billboard album chart with her new album, 1000 Forms of Fear. According to Nielsen SoundScan, 1000 sold 52,000 copies in its first week — the lowest sales for a No. 1 album in almost two years, says Billboard. Though she has released several solo albums, Sia got more attention in the past for collaborating with David Guetta and Flo Rida, and serving as writer and/or featured vocalist for such top stars as Eminem, Beyoncé and Rihanna.

Landing at No. 2 is the resurgent Frozen soundtrack (up from No. 5 last week), with 46,000 copies, with Sam Smith's In the Lonely House pretty much holding steady at No. 3 (42,000). Trey Songz's Trigga, which entered the chart at No. 1 last week, falls to No. 5 (34,000), while Ed Sheeran's x dips from No. 2 to No.4 with sales of 35,000.

There's better news for a veteran rock act, Judas Priest, which enjoys its highest-charting album ever as its Redeemer of Souls debuts at No. 6 (33,000). The Now 50 compilation sold 22,000, enough to take it from No. 11 to No. 7, and the Dirty Heads enter at No. 8 with Sound of Change (21,000).

Rounding out the top 10 are Miranda Lambert, down from No. 7 to No. 9 with Platinum (20,000), and recent chart-topper Lana Del Rey, falling from No. 8 to No. 10 with Ultraviolence (18,000).