Austin musician Mama Duke is asking her audience for their support in the America's Got Talent quarterfinals — and since going viral with her audition, it looks like she has a lot of support to work with. Mama Duke made a big impact right away at her audition. She sang a brand-new original song,Feels So Good To Be You, a disco-flavored rap track that almost instantly reached No. 5 on the iTunes pop chart. Her palpable joy and confidence got the audience on their feet, along with all four ju...