BNA HD: Cumulus, Xperi and Super Hi-Fi have partnered to launch two experimental digital multi-cast stations in Nashville today (2/27). WGFX-HD2 is airing "The Hill," developed in partnership with Green Hill High School and aimed at students with a variety of Pop, Hip-Hop, Alternative and Country music. WGFX-HD3 airs "Nashville Songwriter Radio" featuring music written and performed by local songwriters. The stations also serve as testing grounds for Xperi's in-vehicle radio experience technology and Super Hi-Fi's AI-driven programming and production services. Details here.