Less than a year ago, this singer and songwriter of Christian musical roots was opening for John Mayer and Sheryl Crow. Since then, Mat Kearney has transformed himself into a headlining musician with the 2006 release of Nothing Left to Lose - music with an acoustic base speckled with hip-hop elements and spoken word, with its own pop sensibility. See this rising artist when he stops by the 9:30 Club on Monday, appearing with the Feeling and Rocco DeLuca and the Burden. Doors open at 7:30 p.m. The venue is at 815 V St. N.W., Washington. Tickets are $20. Call 202-265-0930 or go to 930.com.