“Pitch Perfect 3” is the Barton Bellas’ swan song. Not that we needed three of these movies — the first one was a blast, and it’s been a matter of diminishing returns ever since — but nevertheless, here we are. And I couldn’t imagine a better person to aca-analyze this movie with me than my dear friend Kearran Giovanni, star of the TNT series “Major Crimes” and a Broadway musical veteran. Kearran liked the movie better than I did, but I’ll jump at any opportunity to get together over wine with my talented (and extremely busy) friend. Please enjoy our conversation from the TCL Chinese Theatre in Hollywood.