Melissa Backstrom knows her voice really well. She’s super consistent and her intonation is some of the best I’ve ever heard. Modern vocals take a lot of recording for a pop tune like this. In particular 3 different takes of the melody as well as multiple takes of the harmonies. You want to get them crisp and big with interesting variability concerning filtering and EFX. Certain lines want some heavier delay on them and so on. Not to mention, as always, the right emotion which takes some experimenting to get the line down. We inject meaning here, they are not just words and notes. Intention is key. Below is a finished tune with Melissa’s voice so you can hear the control and intonation. She’s a pro what can I say!