The song keeps a sizable lead at No. 1. Meanwhile, Lukas Graham's "7 Years" takes over as the best-selling song in the country, Mike Posner's "I Took a Pill in Ibiza" reaches the Hot 100's top 10 and Meghan Trainor's "No" debuts just outside the top tier.

Rihanna's "Work," featuring Drake, spends a fourth week at No. 1 on the Billboard Hot 100 (dated March 26). Plus, Lukas Graham's "7 Years" crowns the Digital Songs chart, Mike Posner's "I Took a Pill in Ibiza" rises to the Hot 100's top 10 and Meghan Trainor's "No" debuts just beyond the top bracket, while making a big first-week splash in sales and airplay.

As we do every Monday, let's run down the Hot 100's top 10 and more. Highlights of the airplay, sales and streaming-based Hot 100 post on Billboard.com each Monday, with all charts updated each Tuesday.

"Work," released on Westbury Road/Roc Nation, also claims a fourth week atop the Streaming Songs chart with 36.9 million U.S. streams, down 8 percent, in the week ending March 10, according to Nielsen Music. The lead single from Rihanna's album Anti also tops the subscription services-based On-Demand Songs chart (16.3 million, down 14 percent) for a fifth frame. It drops 2-3 on Digital Songs (109,000 downloads sold, down 29 percent), which it led for two weeks, and rises 4-3 on Radio Songs (113 million in airplay audience, up 8 percent).

"Work" rules Billboard's Hot R&B/Hip-Hop Songs chart for a sixth (nonconsecutive) week. As reported when the song reached No. 1, "Work" is Rihanna's 14th Hot 100 leader, upping her into a solo share of the third-most No. 1s all-time, passing Michael Jackson (13). The Beatles lead with 20 No. 1s, followed by Mariah Carey (18). "Work" is also the record-breaking ninth Hot 100 No. 1 in a row by non-U.S.-born acts (Rihanna is from Barbados; Drake, from Canada), while this week marks the record-extending 36th straight week that non-American acts have led the Hot 100.

Justin Bieber Scores First Adult Pop Songs No. 1 With 'Love Yourself'

"Work" keeps atop the Hot 100 with a roughly 3-to-2 lead in chart points over Justin Bieber's "Love Yourself," which holds at No. 2 after leading for two (nonconsecutive) weeks. Still, "Love" spends a fifth week at No. 1 on the Radio Songs chart (155 million, essentially even from last week). It stays at No. 5 on Streaming Songs (13.9 million, down 4 percent) and rebounds 8-7 on Digital Songs (73,000, down 8 percent). As previously reported, the Ed Sheeran co-written single becomes Bieber's first No. 1 on the Adult Pop Songs radio airplay chart.

Twenty One Pilots' "Stressed Out" is also steady on the Hot 100, at No. 3 after rising to No. 2. It keeps at No. 2 on Radio Songs (140 million, down 3 percent) and No. 6 on Streaming Songs (13.5 million, down less than 1 percent) and reverses course (7-6) on Digital Songs (75,000, down 8 percent). "Stressed" leads Billboard's Hot Rock Songs chart for a 12th week.

Flo Rida's 'My House' Makes Itself at Home Atop Pop Songs Chart

Flo Rida's "My House" is additionally stationary on the Hot 100, at its No. 4 high. As previously reported, the track rises to No. 1 on the Pop Songs radio airplay chart, where it's his fifth No. 1 and first since "Whistle" in 2012.

Danish pop band Lukas Graham, led by Lukas Graham Forchhammer, surges into the Hot 100's top 10, jumping 9-5 with "7 Years," the pop band's first chart entry. The single, first a global hit beginning late last year, is the newly-minted top-selling song in the U.S., climbing 4-1 on Digital Songs (121,000, up 27 percent). The piano-powered track is the first Digital Songs No. 1 by a group since R. City's "Locked Away" (featuring Adam Levine) led the Sept. 12 list. (Like "7 Years," "Locked" was also a group's debut hit.) "7 Years" ascends 9-7 on Streaming Songs (13 million, up 22 percent), adding dual top Digital and Streaming Gainer honors on the Hot 100, and 27-19 on Radio Songs (48 million, up 22 percent).

(Technically, Lukas Graham is one of two Grahams in the Hot 100's top 10. As Chart Beat reader Pablo Nelson of Oakland, Calif., notes, Drake's real name is, of course, Aubrey Drake Graham.)

Kendrick Lamar's Surprise 'Untitled' Debuts at No. 1 on Billboard 200 Chart

Zayn's "Pillowtalk" stays at No. 6 on the Hot 100, after debuting at No. 1 five weeks ago, and claims the chart's top Airplay Gainer award, as it pushes 15-13 on Radio Songs (65 million, up 21 percent). G-Eazy and Bebe Rexha's "Me, Myself & I" holds at its No. 7 Hot 100 peak, while ruling Billboard's Hot Rap Songs chart for a sixth week.

Bieber's former three-week No. 1 "Sorry" slides 5-8 on the Hot 100. Having spent all 20 of its weeks in the top 10, the song is a week away from potentially tying his own "What Do You Mean?" (2015-16), Maroon 5's "Sugar" (2015) and Nicki Minaj's "Starships" (2012) for the most consecutive weeks logged in the Hot 100's top 10 from their debuts: 21 each.

DNCE's debut hit "Cake by the Ocean" rebounds 10-9 on the Hot 100, returning to its best rank.

Rounding out the Hot 100's top 10, Mike Posner powers 14-10 with "I Took a Pill in Ibiza." Fueled by its SeeB remix, the track lifts 10-9 on Digital Songs (64,000, up 8 percent); bullets for a second week at No. 14 on Streaming Songs (9.8 million, up 7 percent); and climbs 18-14 on Radio Songs (55 million, up 9 percent).

Posner notches his second Hot 100 top 10 nearly six years after his first, the No. 6-peaking "Cooler Than Me." (As he playfully sings in "Ibiza": "I get along with old-timers 'cause my name's a reminder of a pop song people forgot …") While Posner's break between his first two top 10s is lengthy, it's not even close to a record: Dobie Gray took "Drift Away," his first top 10, to No. 5 on the Hot 100 in 1973. More than 30 years later, in 2003, he finally returned to the region with the same composition, as featured on Uncle Kracker's No. 9-peaking remake. (Beyond an act's first two top 10s, Gray also holds the record for the longest span between any two Hot 100 top 10s overall. Among artists billed as leads on bookending hits, Paul McCartney holds the mark for the longest top 10 hiatus: more than 29 years.)

Meghan Trainor, Kendrick Lamar Rule Billboard + Twitter Trending 140 Chart With New Releases

Just outside the Hot 100's top 10, Meghan Trainor's "No" debuts at No. 11, marking her highest entrance among seven entries so far. The lead single from her sophomore full-length Thank You, due May 13, opens at No. 2 on Digital Songs (113,000 sold in its first week), following its March 4 release. "No" also blasts in at No. 21 on Radio Songs (46 million), marking the highest debut on the chart in more than five years, since Lady Gaga's "Born This Way" rocketed in at No. 6. Only one other song in the past 10 years has launched at No. 21 or better on Radio Songs: Beyonce's "Déjà Vu," featuring Jay Z (No. 15, 2006). "No" adds 3.3 million first-week domestic streams (without an official music video or official clip on Trainor's Vevo channel featuring the song's audio yet released).

Trainor tallied three Hot 100 top 10s from her No. 1 Billboard 200 debut Title: the eight-week No. 1 "All About That Bass" (her highest prior Hot 100 debut, No. 84), as well as "Lips Are Movin" (No. 4) and "Like I'm Gonna Lose You" (featuring John Legend) (No. 8). (She additionally co-wrote Rascal Flatts' top 10 Country Airplay hit "I Like the Sound of That," which climbs 72-67 on the Hot 100 this week.)

Find out more noteworthy news in the weekly "Hot 100 Chart Moves" column to post later this week. And, visit Billboard.com tomorrow (March 15), when all rankings, including the Hot 100 in its entirety, will refresh, as they do each Tuesday.