Sam Smith, Iggy Azalea, 'Weird Al' Yankovic Atop Billboard Artist 100
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The British singer/songwriter reigns again, ahead of Azalea, who holds at No. 2, and newly-arriving Yankovic at No. 3.

Sam Smith leads the new Billboard Artist 100 chart for a second week, fending off Iggy Azalea at No. 2 and new Billboard 200 leader "Weird Al" Yankovic at No. 3.

The list, which launched two weeks ago, provides the first-ever weekly ranking dedicated to measuring artist activity across Billboard's most influential charts, including the Billboard Hot 100, Billboard 200 and Social 50, among others. The Artist 100 is modeled after the formula utilized to compile Billboard's annual Year in Music Top Artist list (as well as the Billboard Music Awards Artist of the Year category), blending information from album and track sales, radio airplay, streaming and social media fan interaction to provide a weekly multi-dimensional ranking of artist popularity.

MAGIC!'s 'Rude' No. 1 On Hot 100, Sam Smith's 'Stay With Me' Surges

Smith rules the Artist 100 again, with most of his points split a fairly comparable mix of digital song sales (36 percent), album sales (27 percent) and radio airplay (25 percent). Notably, he's aided by streaming gains after his hit "Stay With Me" became available on Spotify on July 12; it bounds 15-5 on the Streaming Songs chart and pushes 5-3 on the Hot 100. His debut full-length "In the Lonely Hour" dips 3-6 in its fifth week on the Billboard 200 with 35,000 sold (down 17 percent), according to Nielsen SoundScan.

Rapper Azalea holds down the No. 2 spot on the Artist 100 for a second week. Songs sales account for the largest portion of her chart points (39 percent), with her singles "Fancy" (featuring Charli XCX) and "Black Widow" (featuring Rita Ora) having sold 155,000 and 59,000 downloads, respectively, in the chart's tracking week. Ariana Grande's "Problem," featuring Azalea, sold 114,000. (An act in a featured role claims a smaller portion of a song's overall points than the lead act for purposes of the Artist 100's tabulation.)

'Weird Al' Yankovic Gets First No. 1 Album On Billboard 200 with 'Mandatory Fun' 

Meanwhile, Yankovic lands the Artist 100's top debut at No. 3. The parody master bows with 89 percent of his chart points owed to the bow of "Mandatory Fun" at No. 1 on the Billboard 200 with 104,000 copies sold.

Pop/reggae quartet MAGIC! and singer/songwriter Jason Mraz round out the Artist 100's top five at Nos. 4 and 5, respectively. MAGIC!'s "Rude" rules the Hot 100 for a second week, while Mraz launches at No. 2 on the Billboard 200 with "YES!" (81,000 sold).

Like Yankovic, Bleachers parlay a notable Billboard 200 debut into an Artist 100 arrival. As the band's "Strange Desire" begins on the Billboard 200 at No. 11 (21,000 sold), the act enters the Artist 100 at No. 51, with 78 percent of its points from the set. Still, lead single "I Wanna Get Better" contributes to the group's Artist 100 standing; it reaches the Hot Rock Songs top 10 (12-10) in its 19th week and spends a third week at its No. 2 highpoint on Alternative Songs. The track also surges by 78 percent to 723,000 U.S. streams in the Nielsen BDS tracking week ending July 20. Its video was directed by actress Lena Dunham, girlfriend of Bleachers frontman (and fun. member) Jack Antonoff.

Reflecting the Artist 100's variety in sound and artists' career stages, alternative icon Morrissey (No. 88) debuts back-to-back with rising dance foursome Clean Bandit (No. 89). The former starts with nearly all his chart points from the debut of his album "World Peace Is None of Your Business" at No. 14 on the Billboard 200 (16,000 sold). The latter launches with the bulk (56 percent) of its sum from digital song sales, as its breakout hit "Rather Be" (featuring Jess Glynne) roars 32-22 on the Hot 100 (60,000 downloads sold, up 19 percent).