Awesome! I actually have two:
1. Nadir, somehow, drags Erik out to dinner to get him out of the house, and the restaurant they go to is having a open mic karaoke night, and Christine happens to be there with her friends. After suffering through the first several acts, Christine’s friends push her on stage, and he hears her sing. What happens from there is up to you.
2. Christine has a YouTube channel where she sings covers of songs she likes and maybe some of her own, and one day, a bored Erik stumbles upon her channel. What happens from there, once again, is up to you.