Ummaguma, Meddle, Atom Heart Mother - all early, trend-setting stuff, but it wasn't until Dark Side came out that Pink Floyd really took off...and never landed.

The Wall was good, previously Wish You were Here was fantastic, Animals, The Division Bell, (Echoes I have not heard)... what a great band, paving the way for same era ELP, Yes, and Genesis, and even for the later, more obscure, Hawkwind.

Now, these are memories.... Good Thread!