Generate a gloomy and desolate composition by creating a slow and dissonant piece that evokes feelings of emptiness and solitude. Craft a melody that portrays a sense of abandonment and isolation through the use of minor chords and a sparse, mournful rhythm. Include elements like long pauses and unresolved harmonies to enhance the atmosphere of melancholy and despondency. Aim to convey a feeling of despair and heaviness in the composition to bring out the low valence and low arousal levels in the music.