Generate a composition prompt: Create a piece with a sense of deep sorrow and melancholy, evoking feelings of sadness and contemplation. Craft a melody that conveys a poignant and introspective mood, embodying a mix of despair and reflective solemnity. Aim to use slow tempos and expressive phrasing to capture the emotional depth of the theme, resonating with a low valence and arousal level throughout the piece.