Think about sound as weather. Some recordings are a gentle drizzle; others, a clear-sky afternoon. "Peace" could be a hush, the aperture of a piano held open; it could be a wall of synths that softens the edges of a day. The MP3 compression itself participates in the aesthetic. Get a high-bitrate file and the harmonics breathe; grab a low-bitrate rip and the song weathered, digital grit adding character — like pages yellowing in sunlight.