Doja tellsBillboardshe had to push herself to do a good job on the song, which Olivia Newton-John and John Travolta took to number-one in 1978 -- 17 years before she was born. Doja says"Back then, music was so different and so carefully done. It wasn't just loops and beats, which is why I feel like this was a bit harder for me. I can't believe I was able to kind of hit some of those notes because it's a very difficult song to sing. I'm happy about it."