Taylor Swift No. 1, Florence + The Machine & Jason Derulo Hit Top Five on Billboard Artist 100

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Taylor Swift performs during The 1989 World Tour live at Heinz Field on June 6, 2015 in Pittsburgh, Pennsylvania.

Swift logs a 28th week as the country's top musical act, while new albums by Florence + the Machine & Derulo help the acts surge.

Taylor Swift tops the Billboard Artist 100 (dated June 20) for a record-extending 28th week. She remains the top musical act in the U.S. despite challenges from Florence + the Machine and Jason Derulo, both new to the top five.

The Artist 100 is the first weekly survey dedicated to measuring artist activity across Billboard's most influential charts, including the Billboard Hot 100 songs chart, Top Album Sales and the Social 50. The Artist 100 blends data measuring album and track sales, radio airplay, streaming and social media fan interaction to provide a weekly multi-dimensional ranking of artist popularity.

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Swift stays atop the Artist 100 despite a 6 percent slide in overall activity. Florence + the Machine debut at No. 2 as the Florence Welch-led act's How Big How Blue How Beautiful becomes its first No. 1 on the Billboard 200 and enters Top Album Sales at the summit with 128,000 in traditional album sales. Album sales account for 72 percent of the band's Artist 100 standing.

As Maroon 5 holds at No. 3 on the Artist 100, Derulo hits a new high, vaulting 12-4 (up 52 percent) as his album Everything Is 4 debuts on Top Album Sales at No. 8 (22,000). Unlike Florence + the Machine, Derulo's support stems most largely not from albums but singles, led by his current hit "Want to Want Me," up 7-5 on the Hot 100. Even as his new LP, featuring "Want," launches, album sales mark his third-greatest Artist 100 points contributor (27 percent). Airplay and digital song sales lead at 30 percent each.

Rounding out the Artist 100's top five, The Weekend dips 4-5.

Also notable on the Artist 100, Billy Currington hits a new high, vaulting 85-32 (up 136 percent) as his Summer Forever debuts at No. 9 on Top Album Sales (21,000). The album's lead single, "Don't It," became his ninth Country Airplay No. 1 on the June 6 chart. New single "Drinkin' Town With a Football Problem" kicks off this week at No. 41.