Yes, we are speaking of all those fabulous golden 70' ties prog bands and especially The Mighty Mellotron. Man I love this tank of an instrument.
When you have had all the crescendos , the bombast at its peek, then the Mellotron comes in and gives you shivers down your spine.
Don't forget Kansas.!!! And of course all of the newer prog bands
For the prog lovers, check this website.. http://www.progarchives.com
. But once you've started, be heeded, addiction may occur.