The Black Keys, Avett Brothers and the String Cheese Incident lead the 2013 Forecastle Festival line-up, which also includes Jim James, the Alabama Shakes, the return of the Flaming Lips and more.The festival will be on July 12-14 at Waterfront Park. Weekend passes go on sale at noon Wednesday via ForecastleFest.com,Ticketmaster.comand Ticketmaster outlets. The initial price is $125, but increases as each price level sells out. (Here's more on ticket pricing.)Other musicians of noteworthiness include Old Crow Medicine Show, Grace Potter and The Nocturnals, Big Boi, Sharon Jones and The Dap-Kings, Bob Mould Band and Baauer, which is responsible for the (absurd) "Harlem Shake" viral video phenomenon.Here's the full list of performers announced so far from Forecastle:The Black KeysThe String Cheese IncidentThe Avett BrothersThe Flaming LipsAlabama ShakesJim JamesAnimal CollectiveOld Crow Medicine ShowGrace Potter & The NocturnalsThe Forecastle Incident (with special guests)Young the GiantBig BoiMatt & KimSharon Jones & The Dap-KingsPurity RingThe Joy FormidableDatsikDawesGrizKurt Vile & The ViolatorsToro y MoiBob Mould BandEl-P & Killer MikeBaauerBombinoMoon TaxiFreakwaterFoxygenGreensky BluegrassWild BelleTift MerrittShovels & RopeSalvaNight BedsMNDRChurchillRyan HemsworthRubblebucketAlasdair Roberts & FriendsMonaThe 23 String BandWheeler BrothersA Lion Named RoarThe PassSome videos below.Alabama Shakes:Black Keys:Jim James:A few of this year's performers are Forecastle veterans. For instance, Jim James—who recently released a solo album "Regions of Light and Sound of God"—performed in 2012 with My Morning Jacket, and the band also curated that year's festival. Flaming Lips, who are set to release the album "The Terror" on April 1, were headliners in 2010. And in 2011, Big Boi was a headliner for Halfway to Forecastle, an abbreviated festival staged after Forecastle took that year off after partnering with AC Entertainment. Black Keys, Avett Brothers and others also played past Forecastles.Louisville performers include The Pass, Freakwater and A Lion Named Roar.Forecastle notes that this is an initial line-up of confirmed performers; more should follow.This will be the second full Forecastle Festival since it joined with the Knoxville-based AC Entertainment, which also produces Bonnaroo.