Taylor Swift

Taylor Swift talks about her new "app" on Good Morning America on November 11, 2014. 

ABC/Ida Mae Astute

The Billboard Artist 100 confirms what already seemed a given: Taylor Swift is the biggest music act in the U.S. again this week.

Swift also becomes the first act to lead the Artist 100 for as many as four weeks (the past three consecutively). She passes Sam Smith, who's topped the chart for three total weeks (dating to the list's July 19 launch).

The Artist 100 provides the first weekly ranking dedicated to measuring artist activity across Billboard's most influential charts, including the Billboard Hot 100 songs chart, Billboard 200 albums chart 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.

Taylor Swift's '1989' Spends Second Week at No. 1 on Billboard 200

Swift again sports a comfortable lead over runner-up Meghan Trainor (2-2). Despite a 43 percent loss in chart points, coupled with Trainor's 18 percent uptick, Swift boasts more than four times as many points as Trainor; last week, Swift held a massive nearly 10-to-1 lead in points. Swift's decline is owed largely to a 69 percent drop in sales for her two-week Billboard 200 No. 1 1989, which drops from 1.28 million to a still-exceptional 402,000 copies sold, according to Nielsen SoundScan.

Taylor Swift Still No. 1 on Hot 100; Ariana Grande, The Weeknd Hit Top 10

For a second week, Swift crowns the Artist 100, Hot 100 and Billboard 200 simultaneously. No other act has scored such a chart hat trick.

Rounding out the Artist 100's top five below Swift and Trainor, Maroon 5 (3-3) and Smith (4-4) hold steady, while Ariana Grande jumps 7-5.

Calvin Harris achieves a milestone on the Artist 100, becoming the first DJ to reach the top 10. He roars 21-9 (up 59 percent in points) as his new album, Motion starts at No. 5 on the Billboard 200 with 35,000 sold. The set features cameos from Ellie Goulding, Haim and Gwen Stefani, in addition to John Newman, who sings the top 20 Hot 100 hit "Blame."

Also notably, Mr. Probz crashes the Artist 100's top 40 (43-37) with his breakout hit "Waves." The Dutch pop/dance singer-songwriter gains by 8 percent in overall chart points, with airplay and digital sales for "Waves" roughly even in driving the song's success. The track reaches the Radio Songs top 10 (15-10) with a 16 percent increase to 65 million in all-format listenership, according to Nielsen BDS. On Digital Songs, "Waves" swells 26-25 with a 15 percent gain to 51,000 downloads sold.

"Waves" should maintain momentum: a new remix by Robin Schulz, featuring Chris Brown and T.I., was released for digital purchase on Nov. 11.

View the complete Billboard Artist 100 chart here and in the new issue of Billboard magazine (dated Nov. 15), on sale tomorrow (Nov. 14).

Additional reporting by Gordon Murray