The appeal of turn-of-the-millennium neo-soul was always its familiarity, the way it recalled the classic urban sounds of the '70s. But its leading exponents surely hope they'll one day create nostalgia for their own work. The successes of Maxwell and Jill Scott, who are joining forces for a summer tour, suggest it just might happen. After he sat out most of the '00s, Maxwell's BLACKsummers'night topped the charts last year and won two Grammy Awards. And songwriter, poet, actress and activist Jill Scott, who also boasts multiple Grammys, should have her latest set of retro-leaning R&B, The Light of the Sun, ready for a summer release.