Lee Hyori's solo career began immediately after she left ‘90s-era girl group Fin.K.L in 2003, and she's never looked back, building a new legacy for herself on thumping jams as bold and outspoken as she is. Her sound has evolved throughout her career: She's gone from dousing her hooks in a K-pop cocktail of R&B, hip-hop, and electro-pop to embracing a retro big band style on 2013's “Miss Korea.” But her confident lyrics are still all about asserting herself and lifting up other girls in the process.