Arlo Parks, “Collapsed in Sunbeams" (Transgressive)The first full-length album by Arlo Parks delivers on the promise of the intriguing pieces that have led some to tag her already as the voice of a generation, riding a gentle R&B retro-soul groove that soars with cinematic imagery.A 20-year-old child of West London, Parks counts an eclectic range of influences, from Nigerian Afrobeat artist Fela Kuti to Otis Redding, but a more tempting comparison is Sade, the British artist whose exotic looks,