"Key Recordings" of Sun Ra

Hello,

I just subscribed to this list, and I am interested in what albums of Sun Ra are "key recordings", the great records. In an music-encyclopedia I read that "Angels and Demons at play" was a very good album, a free-jazz kin of album (but perhaps all his music is).

Well, I'm just getting to know his music, and only listened to some audio-clips and the 1984 album "Reflections in Blue".

I hope some of you can give me some suggestions (I know that maybe this question will make (some) of you jump out of your seat hyper-activally and hit the Reply-button when you come down).

                            Johannes Wijffels