There’s a sense of continuity that runs through the music that San Francisco’s Scott Hansen makes as Tycho. But Weather, his follow-up to 2016’s Epoch, marks a major shift: It’s his first album to feature vocals—not just massaging them into the mix, but setting them front and centre. That’s hardly unusual for Tycho’s brand of chill, but where his peers might recruit a rotating cast of featured singers, Weather’s eight vocal tracks are all the work of just one person: Saint Sinner, a.k.a. Hannah Cottrell—a Texas singer-songwriter with very little on record until now. Hansen had wanted to work with a singer for years, but nothing had ever clicked. With Cottrell, things were different, and before long a handful of demos had turned into an entire album. "I just kind of followed her on her trip,” Hansen tells Apple Music. “I wanted this to be somebody nobody had ever heard of. I was just like, this isn't a feature, this is literally what Tycho is right now.” Through each of the album's tracks, Hansen tells us more about that transformation.