My uncle might be schizophrenic. HELP?(this time more specific and more specific of an answer)?

My uncle said he's hallucinating old nickelodeon cartoon characters like angelica, tommy, chuckie, arnold, rocko, rudy, snap, a girl, eliza, a vine dude, and MANY MANY others. And also he was singing joy to the world by three dog night. Should I be concerned? It might be some kind of auditory and music hallucination mixed all together.