 However, few mimicked their later free-form style (heard on "Yes Sir, I Will" and their final recording, "Ten Notes on a Summer's Day").Their painted and collage black-and-white record sleeves (by Gee Vaucher) may have influenced later artists such as Banksy (with whom Vaucher collaborated) and the subvertising movement.Anti-folk artist Jeffrey Lewis's 2007 album, "12 Crass Songs", features acoustic covers of Crass material.