Since its formation by Yale-educated music student Dave Longstreth in 2002, Brooklyn-based indie outfit Dirty Projectors has released a Don Henley-themed concept album, an album of re-interpreted Black Flag songs, and a single with David Byrne. Now the band’s eighth studio album finds the group diving into its own quirky, sweet, rock-tinged experimental pop. On “Cannibal Resource,” bass chases retro guitar into a unique blend of Longstreth’s falsetto and female vocals that are simultaneously angelic and eccentric. “Useful Chamber” is an opus that unfolds in distinctly different sections across restrained percussion, ambient vocals, and edgy electric guitar. Stripping down to a handful of essential ingredients, Dirty Projectors has created something interesting and complicated while avoiding unnecessary ornamentation.