Two siblings are positioned to take over for Kenny Chesney once the sun finally sets on his current No. 1 single.

The Montgomery brothers -- John Michael and Eddie -- are just two of the hitmakers now rising on Billboard's country singles chart. In addition to John Michael's "Letters From Home," the Top 10 now includes "If You Ever Stop Loving Me" by Eddie and his partner, Troy Gentry.

"When the Sun Goes Down," Chesney's collaboration with Uncle Kracker, remains at No. 1 for another week. The CD of the same title claims the top spot on Billboard's Top Country Albums chart for an 11th consecutive week. An album cut -- "I Go Back" -- debuted at No. 57 on this week's singles chart even though Chesney's record label hasn't even officially begun seeking airplay for the song.

Despite increased airplay in recent weeks, Keith Urban's "You'll Think of Me" is gridlocked at No. 2 and still hasn't managed to bump Chesney from the top of the country singles chart. John Michael Montgomery's "Letters From Home" rises two slots to No. 3. Rascal Flatts' "Mayberry" spends a second week at No. 4, and Buddy Jewell's "Sweet Southern Comfort" slips two notches to No. 5. Coming on strong is Gretchen Wilson's "Redneck Woman," which climbs to No. 6 just six weeks after its official release to country radio stations. Tracy Lawrence's "Paint Me a Birmingham" stays at No. 7, but it's the next three titles that promise to shake up the chart in the coming weeks. George Strait's "Desperately" climbs two spaces to No. 8, Lonestar's "Let Us Be Us Again" jumps three levels to No. 9 and Montgomery Gentry make an impressive six-position leap to No. 10.

Another track destined for the Top 10 -- Toby Keith's "Whiskey Girl" -- soars from No. 25 to No. 16 to become the week's fastest-rising single. Craig Morgan racked up the highest-debuting single of the week with "Look at Us." In addition to Chesney's "I Go Back," other new singles entering the chart include Phil Vassar's "In a Real Love," Clint Black's "The Boogie Man" and newcomer Lane Turner's "Always Wanting More (Breathless)."

On the country albums chart, it's pretty much business as usual. With When the Sun Goes Down comfortable in the top position, Urban's Golden Road and Lawrence's Strong climb to the second and third places, respectively. Keith's Shock'n Y'all dips to No. 4, Alan Jackson's Greatest Hits Volume II moves up to No. 5 and Josh Turner's Long Black Train slides to No. 6.

Songs Inspired by The Passion of the Christ, a compilation born in Nashville, remains at No. 7. Moving up one notch each to eighth and ninth place, respectively, are Chesney's No Shoes, No Shirt, No Problems and Rascal Flatts' Melt.

Gary Allan moves up two levels to return to the Top 10 with See If I Care.

Acclaimed singer-songwriter Allison Moorer has the highest-debuting album of the week. The Duel, her first project for Sugar Hill Records, arrives at No. 55. Debuting at No. 64 is bluegrass ace Sam Bush's King of My World.