[CydeWeys]

In theory it's all music that's under consideration, but in practice it's mostly western, English-language music that has been recorded since the widespread adoption of LP vinyl records starting in the late 1940s (before that recorded music was simply too niche, expensive, and low sound quality). Also, consider that modern music didn't really become what it is today until the Elvis revolution in the late 50s (which is why almost nothing on this list pre-dates the 60s). So Parker and Brubeck are suffering by these metrics.