The first round of fan voting for the inaugural iHeart Radio Music Awards is in the books, as participants used hashtags to cast votes across Facebook and Twitter, with north of 13.2 million ballots cast during the last four weeks. As a result, the initial set of 10 nominees in each of the 10 categories is now down to the five finalists. For the record, Best Collaboration was the most-voted-on category, with more than 3.9 million cast.

Round Two voting began today at iHeartRadio.com/awards and will continue through 4/25. NBC will air the three-hour special on 5/2 from 8-11 ET/PT. Here’s how things are shaping up:

Artist of the Year:
Imagine Dragons
Justin Timberlake
Macklemore & Ryan Lewis
Maroon 5
Rihanna

Song of the Year:
"Hold On We're Going Home," Drake ft. Majid Jordan
"Mirrors," Justin Timberlake
"Radioactive," Imagine Dragons
"Stay," Rihanna ft. Mikky Ekko
"The Monster," Eminem ft. Rihanna

Best Collaboration:
"Holy Grail," Jay Z ft. Justin Timberlake
"Stay," Rihanna ft. Mikky Ekko
"Suit & Tie," Justin Timberlake ft. Jay Z
"The Monster," Eminem ft. Rihanna
"Timber," Pitbull ft. Ke$ha

Best New Artist:
Florida Georgia Line
Icona Pop
Imagine Dragons
Lorde
Macklemore & Ryan Lewis
Passenger

Country Song of the Year:
"Boys 'Round Here," Blake Shelton
"Highway Don't Care," Tim McGraw with Taylor Swift
"It Goes Like This," Thomas Rhett
"Mine Would Be You," Blake Shelton
"That's My Kind of Night," Luke Bryan

Hip Hop/R&B Song of the Year:
"Blurred Lines," Robin Thicke ft. T.I. & Pharrell
"Hold On We're Going Home," Drake ft. Majid Jordan
"Holy Grail," Jay Z ft. Justin Timberlake
"Pour It Up," Rihanna
"Started From the Bottom" - Drake

EDM Song of the Year:
"Get Lucky," Daft Punk ft. Pharrell
"Stay The Night," Zedd ft. Hayley Williams
"Summertime Sadness," Lana Del Rey ft. Cedric Gervais
"Sweet Nothing," Calvin Harris ft. Florence Welch
"Wake Me Up," Avicii

Alternative Rock Song of the Year:
"Demons," Imagine Dragons
"Do I Wanna Know?" Arctic Monkeys
"Pompeii," Bastille
"Royals," Lorde
"Safea Sound," Capital Cities

Best Lyrics:
"Wake Me Up," Avicii (Vocals by Aloe Blacc)
"I Love It (ft. Charli XCX)," Icona Pop
"Say Something," A Great Big World
"Same Love," Macklemore & Ryan Lewis
"Wrecking Ball," Miley Cyrus

Best Fan Army:
Arianators, Ariana Grande
Little Monsters, Lady Gaga
Lovatics, Demi Lovato
Mahomies, Austin Mahone
Rihanna Navy, Rihanna
Swifties, Taylor Swift

The iHeartRadio Awards will be executive produced by John Sykes and Tom Poleman of Clear Channel Media and Entertainment, Ryan Seacrest Productions and Ian Stewart and Hamish Hamilton of Done and Dusted Inc., who will produce the show for NBC Studios. Hamilton will also direct.