John Legend
Charley Gallay/Getty Images for MAC Presents

After eight weeks of sitting at No. 2 behind Pharrell’s “Happy” on Hot R&B/Hip-Hop Songs, John Legend’s “All of Me” steps 2-1 to mark the first leader in his 10-year chart history. Legend first appeared on the list in 2004 as a featured artist on Slum Village’s “Selfish,” also featuring Kanye West (No. 20 peak).

Taking 35 weeks to reach No. 1, “All of Me” becomes the second-slowest chart-topper in the Nielsen era (Dec. 1992 - present) behind R. Kelly’s “Step in the Name of Love” which took 43 weeks to reach the top in 2003.

John Legend's 'All Of Me' Tops Hot 100, Ariana Grande Debuts At No. 3

Legend’s ascent pushes “Happy” to No. 2 after 12 weeks at the top while Iggy Azalea’s “Fancy,” featuring Charli XCX, moves 4-3 for a new peak with all three Digital, Airplay and Streaming Gainer awards. Digitally, the catchy cut rose 104 percent to 22,000 downloads in the week ending May 4, its best sales week yet according to Nielsen SoundScan. On-air, it grew 48 percent to reach 55 million listeners in the week ending May 6, according to Nielsen BDS, and it was streamed 6.6 million times in the U.S., a 59 percent increase, in the week ending May 4.

Jason Derulo’s “Talk Dirty,” featuring 2 Chainz, slips 3-4 in its 22nd week followed by Chris Brown’s “Loyal,” featuring Lil Wayne and French Montana or Too $hort or Tyga, which stays put at No. 5.

Michael Jackson returns to the list for the first time in three years with "Love Never Felt So Good,” alongside Justin Timberlake, debuting at No. 6. The first single from Jackson's May 13 album “Xscape” exploded across all three of the chart's metrics (airplay, sales and streaming) after its premiere on the iHeartRadio Music Awards on May 1. He notches his best rank on the list in more than 12 years behind "Butterflies" which resided at No. 2 for five weeks in early 2002.

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The new track's No. 6 start marks Jackson's 33rd Hot R&B/Hip-Hop Songs top 10 in his 42-year chart history. Dating to the chart's original incarnation in 1942 (then called the Harlem Hit Parade), Jackson ties Gladys Knight & the Pips for 14th place among artists with the most top 10s. James Brown holds the record with 60 top 10s, followed by Louis Jordan (54) and Aretha Franklin (52).

Trey Songz’s “Na Na” stays at its peak position of No. 7 for a third week while Aloe Blacc’s “The Man” dips 6-8 in its 13th week. Beyonce’s “Partition” holds tight at No. 9 and Kid Ink’s “Show Me,” featuring Chris Brown, closes out the top 10 with 8-10 skid.

Outside of the top 10, Jason Derulo's "Wiggle," featuring Snoop Dogg, the second single from Derulo’s “Talk Dirty” album, catapults 48-16 in its second week. The 32-position jump ties Jay Z's "Holy Grail," featuring Timberlake, and Mariah Carey's "#Beautiful," featuring Miguel, for the fourth-greatest since the chart changed from 100 positions to 50 (and adopted its triple-metrics hybrid methodology) in October 2012. In that span, Mike WiLL Made-It's "23," featuring Miley Cyrus, Wiz Khalifa and Juicy J, boasts the biggest vault, having bounded 44 spots (48-4) on Oct. 12, 2013.

Over on Top R&B/Hip-Hop Albums, Iggy Azalea’s “The New Classic” steps 2-1 in its second week despite dropping 57 percent to 23,000 copies. The move makes her the first non-American female rapper to reach the summit in chart history.

Pharrell’s “G I R L” moves 3-2 in its ninth week with a 3 percent rise to 22,000 units while last week’s No. 1 debut, Future’s “Honest,” tumbles to No. 3 with a 63 percent drop to 20,000. August Alsina’s “Testimony” (12,000, down 38 percent) and John Legend’s “Love in the Future” (11,000, down 17 percent) stay put at Nos. 4 and 5, respectively, to close out the top five.