Azalea Banks. I had no idea who she was before atrl.

zara

Kylie Minogue
Tinashe
Zara Larsson
Charlie Puth

I got into Madonna, Cher, Kylie because of ATRL.

Well, really I got into Cher because I wanted to get used to her voice before her Gaga duet came out... But then that never happened.

The one Muse song I like I know because of ATRL.

I think I found out about Brandon Flowers and Josef Salvat because of ATRL.

Have just started getting into Barbra, Aretha, Diana because of Ace's rate.

You clearly haven't learned much about her if you can't even spell her name correctly

On topic : Sarsa

Agree with OP. Outside of ATRL I didn't and don't hear about her unless she's dragging someone like poor Iggy

Azealia. I don't listen to ha but because of ATRL I know I shouldn't.

Halsey is another one I've never heard outside of ATRL

Halsey comes to mind

and Kpop

Hasley

yeah Hasley

Natalia Kills [I don't know a song by her tho, just the name] , Charli XCX, Bjork and Marina & The Diamonds.
Lana to an extent but I mostly found out about her videos and songs on tumblr. Halsey, I also found on Tumblr as well as Melanie Martinez.

I knew Madonna and Janet were big back in the day but I didn't know to what extent until I came on here.

Halsey, Grimes, Tinashe, Becky G, Era Istrefi, Brandy, Zara Larsson...

Jessie Ware. I can never thank my sis iamvladd enough for introducing me to her.