The film, split screens, rowdy images, is the closest I got. Recently learned the featured musician, Jimmi Hendrix famous "Star Spangled Banner" was one of the very last acts, and only about a third of fans were still there. Split screen became popular for awhile after the Woodstock movie came out. A friend of mine at UCLA film school used it for his final project, "Icarus Wish." I can't believe it, it's on YouTube!