Duo overcome upbringing in tough neighborhood to send first single, 'No More,' zooming up singles chart.
Baltimore duo release first CD, Love Crimes, Chicago singer debuts with You Can't Resist, English teen trio return with Steppin' Out.
'Incomplete' slips to #2 on Billboard R&B/Hip-Hop singles chart; Nelly's Country Grammar stays at #1 on albums charts.
Also on bill are Latin-flavored rapper Armareda, old-school hip-hoppers Force M.D.s, the quartet Forever Chozen, others.
R&B acts Ruff Endz, Jessica drop debut albums.