Photo: Sierra Hull, above, made her debut at the Grand Ole Opry at age 11, performing with bluegrass superstar Alison Krauss, another former child prodigy. The Regina A. Quick Center for the Arts at Fairfield University kicks off its 2011-&amp;#8217;12 Sweet Sounds series with rising bluegrass star Sierra Hull &amp;#38; Highway 111, performing at 8 [...]