Singer songwriter Mariana Bell delivers her soulful brand of folk pop across clubs in the city/the region and beyond, weaving elements of rock, jazz and country together with her trademark hook-filled melodies and evocative, passionate vocals.   The Australian-born, Charlottesville-raised Mariana Bell began singing at age 6. As an alto in the Virginia Consort Youth Choir, she continued to hone her talent for melody and harmony, performing at the National Cathedral and the White House.