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The former pair takes over atop Pop Songs with 'Timber,' while the latter twosome's 'Drunk in Love' crowns R&B/Hip-Hop Airplay. Plus, new leaders for Demi Lovato, Avenged Sevenfold, Zac Brown Band and Elvis Crespo (also with Pitbull)

Chart Highlights offers a sneak peek at a select group of Billboard charts every Monday. Find out the top songs, Greatest Gainers and debuts on the surveys listed below.

All our charts are refreshed on billboard.com and Billboardbiz every Thursday and appear in the next issue of Billboard magazine.

Pop Songs
*** No. 1 (1 week)*** "Timber" Pitbull Featuring Ke$ha
Pitbull and featured artist Ke$ha crown Billboard's Nielsen BDS-based Pop Songs radio airplay chart, as "Timber" rises 2-1. The song marks Pitbull's second No. 1 on the chart (among nine top 10s). "Give Me Everything," featuring Ne-Yo, Afrojack and Nayer, topped the tally for three weeks beginning on July 16, 2011. Ke$ha claims her fourth No. 1 on the ranking (also among nine top 10s). Her debut single "TiK ToK" ruled for seven weeks in 2010, followed by "Your Love Is My Drug" (two weeks, 2010) and "Die Young" (three weeks, 2012). "Timber" has topped the sales/airplay/streaming-based Billboard Hot 100 chart for two weeks and sold 2.5 million downloads, according to Nielsen SoundScan.

Greatest Gainer No. 5 "Dark Horse" Katy Perry Featuring Juicy J
Debut No. 31 "Can't Remember To Forget You" Shakira Featuring Rihanna
Debut No. 40 "Show Me" Kid Ink Featuring Chris Brown

Adult Contemporary
*** No. 1 (9 weeks)***/Greatest Gainer "Roar" Katy Perry
Greatest Gainer No. 18 "Say Something" A Great Big World & Christina Aguilera

Adult Pop Songs
*** No. 1 (6 weeks)*** "Counting Stars" OneRepublic
Greatest Gainer No. 9 "Story Of My Life" One Direction
Debut No. 37 "Chocolate" The 1975
Debut No. 38 "She Keeps Me Warm" Mary Lambert
Debut No. 39 "Sleeping With A Friend" Neon Trees
Debut No. 40 "Fight" Lee DeWyze

Dance Club Songs
*** No. 1 (1 week)*** "Neon Lights" Demi Lovato
Greatest Gainer No. 3 "Pompeii" Bastille
Debut No. 45 "Burn" Ellie Goulding
Debut No. 46 "Capture" Dawn Woods
Debut No. 47 "Give" Malea
Debut No. 49 "Better Luck Next Time" Bombs Away

Rhythmic Songs
*** No. 1 (8 weeks)*** "The Monster" Eminem Featuring Rihanna
Greatest Gainer No. 5 "Drunk In Love" Beyonce Featuring Jay Z
Debut No. 35 "They Don't Know" Rico Love
Debut No. 37 "Turn Down For What" DJ Snake & Lil Jon
Debut No. 39 "The Illest" Far East Movement & Riff Raff

R&B/Hip-Hop Airplay
*** No. 1 (1 week)***/Greatest Gainer "Drunk In Love" Beyonce Featuring Jay Z
Beyonce bounds to her sixth R&B/Hip-Hop Airplay No. 1, as "Drunk in Love," featuring Jay Z, jumps 5-1 with Greatest Gainer honors. She'd last led, for seven weeks, with "Love on Top" in 2012. "Drunk" marks Jay Z's eighth leader and second with Beyonce: they reigned for four weeks in 2003 with "Crazy in Love."

Debut No. 34 "O.G. Bobby Johnson" Que
Debut No. 39 "Na Na" Trey Songz
Debut No. 48 "Know You Better" Omarion Featuring Fabolous & Pusha T
Debut No. 49 "Can't Raise A Man" K. Michelle

Adult R&B Songs
*** No. 1 (4 weeks)*** "For The Rest Of My Life" Robin Thicke
Greatest Gainer No. 11 "I Blame You" Ledisi
Debut No. 20 "Where Did We Go Wrong?" Toni Braxton & Babyface
Debut No. 22 "Beautiful" Mali Music

Rap Airplay
*** No. 1 (1 week)***/Greatest Gainer "Show Me" Kid Ink Featuring Chris Brown
Debut No. 21 "O.G. Bobby Johnson" Que
Debut No. 23 "Money Baby" KCamp Featuring Kwony Cash
Debut No. 24 "Part II (On The Run)" Jay Z Featuring Beyonce

Rock Airplay
*** No. 1 (11 weeks)*** "Come A Little Closer" Cage The Elephant

Debut/Greatest Gainer No. 9 "Coming Of Age" Foster The People
Foster the People blast onto Rock Airplay at No. 9 and Alternative Songs (see below) at No. 12 with "Coming of Age," the lead single from the band's sophomore album, "Supermodel," due March 18. The group's breakthrough set, "Torches," reached No. 8 on the Billboard 200 and generated the No. 3 Hot 100 hit "Pumped Up Kicks." "We didn't have any rules. We just created as much as we could in seven days," frontman Mark Foster says of the new album. "And, in the spirit of wanderlust and discovery, we ended up stumbling on the musical identity of what this record was going to feel like."

Debut No. 43 "Heaven Knows" The Pretty Reckless
Debut No. 45 "Modern Jesus" Portugal. The Man
Debut No. 48 "Weak" Seether

Alternative Songs
*** No. 1 (1 week)*** "Do I Wanna Know?" Arctic Monkeys
Debut/Greatest Gainer No. 12 "Coming Of Age" Foster The People
Debut No. 31 "Sleeping With A Friend" Neon Trees
Debut No. 36 "Shark Attack" Grouplove
Debut No. 40 "Skinny Love" Birdy

Adult Alternative Songs
*** No. 1 (4 weeks)*** "Pompeii" Bastille
Debut No. 21 "The Walker" Fitz And The Tantrums
Debut No. 29 "Got It Wrong" The Wild Feathers
Greatest Gainer "Coming Of Age" Foster The People

Mainstream Rock Songs
*** No. 1 (1 week)*** "Shepherd Of Fire" Avenged Sevenfold
Greatest Gainer No. 5 "What If I Was Nothing" All That Remains
Debut No. 37 "Break Down The Walls" Asking Alexandria
Debut No. 40 "Right Back At It Again" A Day To Remember

Country Airplay
*** No. 1 (1 week)*** "Sweet Annie" Zac Brown Band
Greatest Gainer No. 19 "Doin' What She Likes" Blake Shelton
Debut No. 45 "This Is How We Roll" Florida Georgia Line Featuring Luke Bryan
Debut No. 48 "Lookin' For That Girl" Tim McGraw

Latin Airplay
*** No. 1 (3 weeks)*** "Put It In A Kiss" Katherine Alexander
Greatest Gainer No. 11 "El Perdedor" Enrique Iglesias Featuring Marco Antonio Solis
Debut No. 43 "Let Her Go" Passenger
Debut No. 45 "Can't Remember To Forget You" Shakira Featuring Rihanna
Debut No. 50 "Say Something" A Great Big World & Christina Aguilera

Regional Mexican Songs
*** No. 1 (9 weeks)*** "Vas A Llorar Por Mi" Banda El Recodo de Cruz Lizarraga
Greatest Gainer No. 2 "Mujer de Piedra" Gerardo Ortiz
Debut No. 29 "A Los Cuatro Vientos" La Arrolladora Banda el Limon de Rene Camacho
Debut No. 32 "Te Hubieras Ido Antes" Julion Alvarez y Su Norteno Banda
Debut No. 33 "50 Mentadas" Mario "El Cachorro" Delgado

Latin Pop Songs
*** No. 1 (5 weeks)*** "Darte Un Beso" Prince Royce

Debut/Greatest Gainer No. 25 "Can't Remember To Forget You" Shakira Featuring Rihanna
Encompassing its first week of availability, Shakira's "Can't Remember to Forget You," featuring Rihanna, debuts on Pop Songs at No. 31 and Latin Pop Songs at No. 25. The ska-tinged pop/rock track previews Shakira's first RCA Records album, due March 25. "I really like the song. It sounds like a signature Shakira track, but not outdated," says Dave Adams, program director of pop station WRNW Milwaukee, which spun "Remember" 18 times last week. "Rihanna's vocal style is very similar to Shakira's, but she still brings something extra to the song. Their vocals complement each other well. The song has good tempo, as well as a memorable hook, so I think it has a lot of potential to be a hit."

Debut No. 26 "Te Robare" Prince Royce
Debut No. 38 "With Or Without You" Johnny Sky

Tropical Songs
*** No. 1 (1 week)***/Greatest Gainer "Sopa de Caracol - Yupi" Elvis Crespo Featuring Pitbull
Debut No. 18 "El Perdedor" Enrique Iglesias Featuring Marco Antonio Solis
Debut No. 29 "Prometo Olvidarte" Tony Dize
Debut No. 35 "De Cabeza" Wesley Tones
Debut No. 36 "Tengo Curiosidad" Wasabi
Debut No. 38 "Candy" Plan B

Christian Airplay
*** No. 1 (3 weeks)*** "The Only Name (Yours Will Be)" Big Daddy Weave
Greatest Gainer No. 28 "Press On" Building 429 Featuring Blanca Callahan
Debut No. 34 "Hold You Up" Shane Harper
Debut No. 37 "Revival" Soulfire Revolution Featuring Kim Walker-Smith
Debut No. 39 "All Eyes On You" OBB
Debut No. 41 "Difference Maker" Needtobreathe
Debut No. 42 "Kicking And Screaming" Third Day
Debut No. 48 "Good" Dave Barnes
Debut No. 49 "Surrender" Nine Lashes

Gospel Airplay
*** No. 1 (25 weeks)*** "Every Praise" Hezekiah Walker
Debut No. 28 "Better" Jessica Reedy
Debut No. 30 "Help" Erica Campbell Featuring Lecrae