You can only save FOUR

[Meh_itshim]

Rihanna, Ariana, Taylor and Gaga, uh duh!

[Poutsos]

Britney, Madonna, Celine, Janet. Jordan, why you have to refer to everyone as ladies? You do have straight men here, cis gay men, and men who are gay and identify as 'HE.' I get it, its fun sometimes, but calling each other ladies all the time, and I mean it's all over the internet, it puts a stigma on us    Always with love.

[Hooked-On-Knee]

Mariah, Madonna, Britney and Janet.

Music literally wouldn't be the same without them, the rest of the others on this list could have never released music and there wouldn't have been much impact.

[Stefani]

I feel like Britney should've been excluded from the list since 99.9% of us were inevitably going to pick her as someone we'd save, which technically limits us to 3 artists rather than 4 since Britney will be picked by default. 

Anyway based on how much I like their music and excluding personal feelings: Britney (see?), Madonna, Lady Gaga, and Ariana.