Chris Willman Music WriterBig Loud Management has landed a big gun in the form of former Maverick/Live Nation president Greg Thompson, who is moving to the Nashville-based firm as president and partner, effective immediately.He joins fellow partners Seth England, Joey Moi and Craig Wiseman but, unlike his Nashville cohorts, will continue to be based in Los Angeles, where he’s described as “expanding Big Loud’s footprint” to the west coast.It’s not just Thompson’s appointment that has Big Loud