Plumb

From Lastfm:

Singer/songwriter Tiffany Arbuckle-Lee fronted the Dove Award-winning alternative rock band Plumb during the late '90s, and adopted the name Plumb for her subsequent full-fledged solo career. She was born in Indianapolis and grew up in Atlanta, where she took several gigs as a backup singer and wound up touring in that capacity instead of going to college, as she'd planned. She relocated to Nashville, where she landed a record deal based on her session and backup work, and formed Plumb with neighbor/songwriter/producer Matt Bronleewe.

From Wikipedia:

Tiffany Arbuckle Lee (born March 9, 1975) is a Contemporary Christian singer-songwriter who uses the stage name Plumb. She has performed several different genres of music, including alternative rock and Christian alternative rock and a few of her remixes have appeared on dance charts. She is known for her pensive lyrics and soprano voice.