@Juliette
After having recently researched almost these exact same symptoms as your Gran I found out that the brain, if lacking in auditory stimuli or having only a ringing in the ears, can create it's own stimuli in the form of auditory musical hallucinations.
There are also some other causes for these symptoms, most of which can be ruled out by a head CT scan but should, in any case, be followed up by an assessment by a neurologist.
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