Generate a music composition prompt according to low valence and low arousal levels based on the given ABC musical notation:

Create a mournful and pensive composition evoking solitude and reflection. Compose a slow and gentle melody that conveys a sense of deep melancholy and contemplation. Capture the essence of sorrow and isolation through the use of subtle and somber tones, allowing space for introspection and emotional depth in the music. Let the notes express a profound sense of sadness and a tranquil heaviness that resonates with the listener's emotions.