Chicago’s Joan Of Arc tends to avoid conforming to expectations. Instead, the indie-rock band veers off in countless, unanticipated directions. This theme applies not only to the music, but also to the line-up, which has featured a revolving cast of members (many of whom have solo and side projects as well) since Joan Of Arc’s inception from the ashes of Cap’n Jazz in 1995. Joan Of Arc’s sound grew increasingly “difficult” as the years passed, morphing into a startling and sometimes obtuse body of work. If this proved a hard pill for most music critics to swallow, so be it. Joan Of Arc will soldier on. Joan Of Arc performs with Implodes and Tongue Sculptors at 9 p.m. at Johnny Brenda’s; tickets to the 21+ show are $12.