Yesterday Was Forever is the fourth studio album by English singer-songwriter Kate Nash.

Her first album in five years, the record notably sees Nash return to her indie pop roots.

To promote the album, Nash embarked on the Yesterday Was Forever Tour in the United States and Canada, and has performed at several festivals, including Reading and Leeds Festival.

Nash openly confirmed that she has obsessive–compulsive disorder and anxiety and is an advocate for raising awareness for the importance of mental health.

"Musical Theatre" is Nash's personal interpretation of struggling with mental health.