Lady Gaga's first 6 singles reaching #1 on Pop Songs.
Katy Perry's 69-week unprecedented weeks on Hot 100 top 10.
Whitney Houston's 7 consecutive Hot 100 #1s.
Mariah's 16-week reign on Hot 100 with "One Sweet Day"
Michael Jackson & Katy Perry's 5 Hot 100 #1 singles in an album
Katy Perry's 69-week unprecedented weeks on Hot 100 top 10.
Whitney Houston's 7 consecutive Hot 100 #1s.
Mariah's 16-week reign on Hot 100 with "One Sweet Day"
Probably Mariah's, especially since the chart calculations and general single release tactics have changed so much since then. You could be on week 15 at #1 when the next Harlem Shake happens, or a lead single supported by a radio deal and a massive digital debut is surprise released, etc.