My grandfather considers himself a skeptic. His wife (my grandmother) recently passed away, and ever since, he swears that he can hear distant ethereal music late at night, every night, and only in the upper story of his household.
Many people have claimed to experience similar phenomena. Although not identical, here are some other instances of similar occurences. I've seen this dubbed "clairaudience" numerous times.
What are some psychological or neurological explanations for this type of experience?