The WMM does not account for musical memory - it's possible to listen to instrumental music whilst performing other auditory tasks, criticising the model
Clinical evidence supporting STM being more than one component
KF could recall digits better if he read them (VSS) than if they were read to him (PL) - this selective impairment supports the model
Brain imaging studies (MA, 2002) found different areas of the brain active for verbal tasks (inferior frontal cortex) and visual tasks (visual cortex) - this is consistent with the idea that working memory consists of separate components