With a new album that feels like it’s the start of something bigger—bigger hooks, a bigger sound and Rachel Browne’s booming voice—Field Mouse are bounding towards indie rock stardom. While three members reside in Brooklyn and sisters Rachel and Zoë Browne are in Philadelphia, the five-piece carve out time to practice and play in both cities. We caught up with Rachel Browne by phone after a particularly sweaty hike on the eve of Field Mouse’s North American tour. Listen to a premiere of the new album Episodic, out this week.