Jack Johnson jumps to No. 2.

50 Cent still has no competitors on The Billboard 200, as "The Massacre" scores U.S. sales of 771,000 units in its second week on top, according to Nielsen SoundScan. Despite a 32% drop for the Shady/Aftermath/Interscope album, it weighs in more than half a million units ahead of the No. 2 album.

Jack Johnson's "In Between Dreams" (Brushfire Records) -- which debuted at No. 3 last week -- ousts Jennifer Lopez's "Rebirth" (Epic) from No. 2 despite a 49% fall to 118,000. Lopez slips to No. 4 on a 67% slide to 86,000. 50 Cent labelmate the Game jumps 5-3 with "The Documentary," down 13% to 87,000 copies.

Green Day's "American Idiot" (Reprise) gains 6-5 on a 10% drop to 77,000 units. A 6% fall to 59,000 is enough to boost Kelly Clarkson's "Breakaway" (RCA) 9-6. Ray Charles' "Genius Loves Company" (Concord/Hear Music) spends a second week at No. 7 on a 30% slip to 56,000.

The Killers enjoy their first top-10 stint with “Hot Fuss” (Island), which continues up the chart with a 14-8 move despite a 6% dip to 54,000.

Rounding out the top tier, John Legend's "Get Lifted" moves 11-9 on a 13% fall to 53,000, and Eminem's "Encore" (Shady/Aftermath/Interscope) is No. 10 for a second week on a 14% dip to 52,000.

Black Label Society's "Black Mafia" (Artemis) is this week's top debut, at No. 15 with 42,000 copies -- its highest spot on the big chart. The set bows at No. 1 slot on the Billboard Top Independent Albums chart.

Rocketing 36-17, Kenny Chesney's "Be As You Are: Songs From an Old Blue Chair" (BNA) is one of the few Billboard 200 titles to see a gain this week, up 30% to 39,100. The country singer is boosted by a rerun of his appearance with Martina McBride on "The Oprah Winfrey Show." Chesney's 2004 set "When the Sun Goes Down" is also up, moving 63-45 on a 9% gain to 21,000.

Fellow country artist Craig Morgan debuts at No. 40 with "My Kind Of Livin' " (Broken Bow), moving 22,000 copies. Morgan also charted with 2003’s "I Love It,” which opened at No. 190 with 6,500 and has sold 256,000 to date.

Overall U.S. album sales are down 11% from last week at 10.8 million units, about 7% lower than the same week last year. Sales for the year to date are down 9% at 111 million units.