The playing keyboard in the background did nothing but deepen the hole within Maria's soul; it made her feel emptier, colder. The solemn melody was the only thing she could hear, coming from a piano. Maria would see people come up to her, their lips would move, and they were probably offering their condolences, but she couldn't hear them.
Why couldn't she hear them?
She could hear the piano, couldn't she? So why not them?
Maybe the dark music was all in her head and she had gone deaf; the sound might be worsening the brewing storm in her soul, but she loved it. In a way, it all brought her peace.