American Idol Winner Caleb Johnson

American Idol Winner Caleb Johnson performs onstage during Fox's "American Idol" XIII Finale at Nokia Theatre L.A. Live on May 21, 2014 in Los Angeles, California. 

Kevin Winter/Getty Images

Also: Sale pricing in the iTunes Store lifts Linkin Park, while The Vamps take a historic tumble down the chart.

On the latest Billboard 200 albums chart, the Guardians of the Galaxy soundtrack held on to the No. 1 slot for a second week, selling 93,000 copies in the week ending Aug. 17, according to Nielsen SoundScan. Just two new arrivals hit the top 10, led by the Gaslight Anthem at No. 4 and Troye Sivan at No. 5.

Of course, there was lots of action elsewhere on the chart. Let's take a closer look:

– Linkin Park, The Hunting Party - No. 14 - Sale pricing in the iTunes Store for multiple titles pumps the chart's largest percentage gain (up 164 percent) for Linkin Park (16,000 sold for the week). Frozen (No. 2; up 53 percent), Luke Bryan's Crash My Party (No. 10; up 19 percent) and Lorde's Pure Heroine (No. 15; up 85 percent) were also among the discounted sets.

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– Caleb Johnson, Testify - No. 24 – Caleb Johnson, the 2014 champion of Fox's American Idol series, charts the lowest debut for an Idol winner's first album, both in terms of position and sales (11,000). Previously, the 2013 winner, Candice Glover, logged the lowest sales start (19,000 with Music Speaks), while the 2010 champion, Lee DeWyze, had claimed the lowest opening rank (No. 19 with Live It Up).

Kris Allen, Horizons – No. 80 — As the newest American Idol winner debuts at No. 24, a previous champ also debuts: Kris Allen. He took home the crown in 2009 and his new set is his first indie release (4,000).

Eric Roberson, The Box - No. 104 – The singer also starts at No. 8 on Top R&B Albums, selling 3,000 copies. The independently distributed set sold well in Atlanta, where it was the No. 9 biggest-selling album of the week.

– Phillip Phillips, Behind the Light - No. 138 – Phillip Phillips' album posts its first gain in seven weeks, rising by 31 percent to 2,000 after sale pricing at Google Play and back-to-school promotions at other retailers. Its total sales stand at 103,000 after 13 weeks on sale.

– Passenger, All the Little Lights - No. 146 - An interview with NPR's All Things Considered on Aug. 12 pushes a 59 percent sales gain (and reentry) for Passenger's album, while his new release, Whispers, up at No. 103, also returns with a 136 percent climb.

Eric Clapton, ICON - No. 173 - This 2011 album, available only on CD, logs its best sales week yet (2,000) and debuts on the chart, following new positioning and promotion at mass merchants in the past month or so. It's Eric Clapton's 48th charting album.

The Vamps, Somebody to You (EP) - No. 192 - The U.K. pop band's album earns the distinction of the biggest second-week drop on the chart ever for a top 10-debuting album, falling 182 spots (and also down 90 percent in sales).