The Avett Brothers are coming to town again, country star Vince Gill is making his Savannah debut and plenty of genre-spanning musical staples and newcomers are on the lineup of next spring's 2014 Savannah Music Festival. Organizers will unveil the full schedule for the March 20 - April 5 festival's sound-packed 17 days at a free concert tonight featuring mandolinist Sierra Hull, set to perform again during the festival with the legendary Ricky Skaggs. Tennessee native Hull, 22, and her bluegrass band, Highway 111, are set to take the stage at the Charles H. Morris Center, 10 E. Broad St., at 8 p.m. Doors open at 7 p.m., and the event is free and open to the public.  As usual, the festival is offering everything from toe-tapping bluegrass and folk rock to intimate chamber and jazz concerts. "Different stylizations of art is essentially what we do here at the Savannah Music Festival," said Rob Gibson, the festival's executive and artistic director. "We've got so much music. We've got music from Mali. We've got music from Ireland, from Georgia." Gibson said the idea is to give Savannahians and the many out-of-towners who travel to see concerts here an array of shows that let them sit down and listen or stand up and dance. "It's like going to a sushi bar," he said. "You don't go to a sushi bar and order one piece of fish for the night. Some people might. Usually you order about five different types. "... I want this music festival to be like a sushi bar: You listen to bluegrass and rock 'n' roll and blues, and you decide what kind of sushi you like." As someone who grew up listening to Led Zeppelin and the Rolling Stones in the early 1970s and eventually went on to run New York's Jazz at Lincoln Center, Gibson said he hopes younger people take the opportunity to experience classical and jazz music. "Ultimately, my hope is that we get the mid-20s people to see some chamber music," he said. "A lot of people have only heard classical music on a record or been to a symphonic concert and sat 50 rows back when they were a kid, but they've never sat up close." The festival features plenty of louder acts sure to be popular with younger crowds, too. The March 21 set by North Carolina folk rockers The Avett Brothers at Johnny Mercer Theatre is bound to sell out fast. There are also several opportunities to see newer bands with rising popularity that haven't played Savannah before, such as The Lone Bellow, performing March 21 with Aofie O'Donovan. Just a few weeks into a headlining tour supporting the Brooklyn-based alt-folk band's eponymous debut album, singer and songwriter Zach Williams said he's excited to be coming to Savannah. "Savannah, in my mind at least, is kind of a mysterious place," he said. Though it will be his first time performing here, the Acworth native-turned-New Yorker proposed to his wife in Savannah. He hasn't been back since. With songs ranging from melancholic and haunting to more upbeat, the Lone Bellow has gained attention over the past few months, playing before national late-night audiences on "Conan" and "The Tonight Show." While touring recently, Williams said crowds have been a mix of ages, much like the typical Savannah Music Festival audiences. "It's a pretty good mix," he said. "Probably mostly like 20-somethings. There are these couples that I'm meeting all over the country - 60- to 70-year-old people. There seem to be a few in every city that really keep up with the local music scene that come out for music. Since we're kind of country music or Americana or whatever, they come out. It's fun." The Savannah Music Festival is celebrating its 25th year with the 2014 season. It's come a long way since 1989. According to organizers, attendees came from 42 states and 16 countries last year and 40 percent of the audience travels from more than 100 miles away. Last year, more than 35,000 people attended the festival. With more than 100 productions in the lineup, it's billed as Georgia's largest musical event. Part of the festival includes bringing in thousands of schoolchildren during the days for free concerts. Gibson said it's all part of trying to "grow something that lasts." "At 25 years old, we're trying to become an institution and the fabric and life of this community so we can be around in 50 years and continue to bring hip music to this community," he said.   TICKETS AND FULL LINEUP The lineup will be announced at the concert tonight. Tickets go on sale at 10 a.m. Thursday. Go to www.savannahmusicfestival.org to access a full lineup of the 2014 Savannah Music Festival and to buy tickets for concerts. Tickets can also be bought at 216 E. Broughton St. or by phone at 912-525-5050.