Taylor Swift No. 1 on Billboard Artist 100, Justin Bieber Hits New Peak

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Justin Bieber performs at the 102.7 KIIS FM's Wango Tango at StubHub Center on May 9, 2015 in Los Angeles, California. 

Swift remains the country's top musical act, while Bieber returns to the chart's top 40 for the first time in more than nine months.

Taylor Swift leads the Billboard Artist 100 (dated June 27) for a record-extending 29th week, remaining the top musical act in the U.S. Meanwhile, Muse roars onto the chart in the top five and Justin Bieber makes a big rebound.

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, bolstered by a 9 percent gain in overall activity, according to Nielsen Music, while The Weeknd rebounds to his best rank, jumping 5-2 (up 34 percent), as his new single "Can't Feel My Face" debuts at No. 24 on the Hot 100. Maroon 5 holds at No. 3 on the Artist 100.

British alt-rock band Muse debuts at No. 4 on the Artist 100 as its seventh studio effort, Drones, becomes its first No. 1 album on the Billboard 200 and Top Album Sales. The set tops the latter list with 79,000 in traditional album sales, with album sales accounting for 94 percent of the group's Artist 100 standing.

Rounding out the Artist 100's top five, Ed Sheeran rises 6-5.

Also notable on the Artist 100, Bieber hits a new high and returns to the chart's top 40 for the first time in more than nine months, as he lifts 58-32 with a 49 percent gain in activity. The addition of Tumblr and Vine to the reporting pool on the Social 50 helps spur his rise (social metrics mark 72 percent of his Artist 100 ranking), as does the continued growth of Skrillex and Diplo's hit single "Where Are U Now," on which he's featured. The song rises 19-16 on the Hot 100, 18-16 on Digital Songs (70,000 downloads sold, up 5 percent) and 29-24 on Radio Songs (46 million in all-format audience, up 14 percent).

Bieber had last ranked in the Artist 100's top 40 on the Sept. 13, 2014, chart and previously peaked at No. 34 (July 26, 2014).