What's your favorite compilation album? - eviltoast

I’ve been really enjoying the Red Hot Organization’s “No Alternative” and “Dark was the Night” recently, both because they raised a lot of money for AIDS research and because they do a great job of capturing the 90s alternative sound and 00s indie sound respectively, and it’s got me thinking how much I love compilations generally for how they can give you an impression of a place/time/music scene. Any collections like that you think I should know about?