With her gleaming electronic pop and visuals, Hannah Diamond explores notions of femininity, artifice, and authenticity. Like many of the other artists affiliated with PC Music, Diamond's high-concept style -- which she introduced with 2013's "Pink and Blue" -- is its substance: Her vocals are highly processed, but there's an almost childlike simplicity to her delivery and lyrics; though the synths and beats that back her evoke everything from 2000s Euro-dance to happy hardcore to grime to J-pop and K-pop, they don't sound exactly like anything that came before. While PC Music...