Which two artist if united could yield a track so powerful Hello would move to number 2 next week?

Katy & Anti-musician Rihanna
Katy & Taylor
Rihanna and Taylor
Beyonce and Taylor
Britney and Christina
Gaga and Katy
Beyonce and Rihanna
Bruno + Katy

Which two could or none could?

Tupac + Biggie could do it

Bjork and Katy.

M5, and Christina Maria Aguilera Rutler could. They did block Someone Like You from going #1 on the top 40 chart after all.

All of the above.