XANDER DEMOS’ latest “single,” “Under A Darkened Sky” leaps an impressive 21 spots from its debut position at #78 to land at #57 on this week’s Hit-Tracks Top 100 Chart. Xander comes in ahead of music icons like Joe BONAMASSA, PATTY GRIFFIN and ROBERT PLANT, and KID ROCK. Also making her debut on the all-genre chart, is AMY ROSE. Her …