The Best and Worst Singles of the Week -- From Iggy Azalea to Meghan Trainor

Meghan Trainor
"Lips Are Movin"

Trainor has just one hit to her name thus far, and on her "All About That Bass" follow-up, she can't help but work a sly self-reference into its snappy chorus. "I gave you bass/You gave me sweet talk," she sings in a Southern-inflected patois over sax bleats, helping solidify her as the self-proclaimed queen of her own genre, "she-wop."--Andrew Hampp

Meghan Trainor Tops Hot 100 For Eighth Week

Flo Rida Featuring Sage The Gemini and Lookas

Flo Rida is hardly an innovative rapper, but he's a practiced chart-topper thanks to savvy trend-spotting and an ear for underappreciated talent. On his latest, listeners get yet another horn sample and a killer hook from Sage the Gemini. Knock Flo's lyrical skills if you must, but he knows his way around a hit.-- Dan Hyman

Flo Rida Shares 'Wildest Thing' He's Seen On Tour

Mystery Skulls Featuring Brandy and Nile Rodgers
"Number 1"
Warner Bros.

Mystery Skulls (aka Luis Dubuc) hops on the disco-pop nostalgia train for the unshakable "Number 1" off his recently released debut LP, Forever. Guitarist Rodgers powers this dancefloor sharpshooter, where Brandy's vocals cuddle up to Dubuc's rusty tenor with delicious results.--Steven J. Horowitz

Exclusive: Brandy Breaks Down the Songs of Her Self-Titled Debut 20 Years Later

Shy Glizzy Featuring 2 Chainz and A$AP Rocky

Shy Glizzy's "Awwsome" stands as one of the most giddily unhinged club tracks of 2014, with the rapper exulting his own brilliance in a helium-throated gonzo flow. Now the long-gestating hit has two established stars on the remix, with 2 Chainz and ASAP Rocky admirably supporting the young artist.--Jason Lipshutz

Watch: 2 Chainz Recreates Michael Jackson's 'Thriller' Video

Imagine Dragons
"I Bet My Life"

Following one of the decade's biggest debut rock albums is no easy feat, and Imagine Dragons perform an agile pivot on the folk-tinged "I Bet My Life." A tale of a troubadour settling down with his soulmate, the song is powered by foot stomps and a canyon-sized chorus -- a calling card for the band behind "Radioactive."--Jason Lipshutz

Imagine Dragons Talk Second Album, ‘Radioactive’ Success

Seo Taiji and IU
Seo Taiji/Loen Entertainment

K-pop's folky sweetheart IU and Korean rock legend Taiji venture into new sonic territory with this icy collaboration. The former's melancholy coos and honeyed harmonies stand strong in the latter's symphonic storm of crunchy synthesizers, making for one of the dreamiest pop tracks to come out of the country this year.--Jeff Benjamin

Iggy Azalea Featuring MØ
"Beg For It"
Turn First/Hustle Gang/Def Jam

"Beg for It" finds Azalea reheating the same braggadocio that made her famous on "Fancy," lobbing up similes that don't quite work ("All yellow gold on me, like I'm Trinidad James"). Good for Azalea, though, for giving some shine to Danish alt-pop newcomer MØ, who sings a twisty hook in her best bid yet for U.S. stardom.--Jason Lipshutz

An edited version of this story first appeared in the Nov. 8 issue of Billboard.