One of my favorite drum+bass artists Stunna (aka J. Cappo) out of Chicago. He has a regular show on BassDrive.com His stuff is very melodic. He has live track on SoundCloud that has a 5-6 minute piano solo. I'd say he has taken the LTJ Bukem downtempo/dnb vibe to a new level. Check out his set at the United DnB Battle in Brooklyn last month if you like more of the live MC/Jungle based vibe.