Dave Stewart, where are you? There was a brief slice of history when young, good humoured, educated, musically trained Rock musicians stole the Hammond organ from their parents and redefined this as the instrument of choice for a certain type of progressive rock. Instead of 4/4 marches and the like, however, these boys used the thing differently, strange time signatures with crisp drumming and lyrical, mournful solos. It became metallic, not as in "metal" but as in liquid mercury coarsing the tubes, the sound of late night city streets, the gleaming future...
These groups included Caravan, Rare Bird and others, but king of the heap were Egg.
And this, truly, was their masterpiece.
For beginners, though, Polite Force is the wrong choice, instead better listen to their first album on Spotify, acclimatising to the genre, but if that takes your fancy there is no finer song anywhere of this type of thing than "A vsit to Newport Hospital, a track that begins (and ends) inauspiciously with a driving heavy riff, but sandwiched between is 5 minutes of the most transcending music you could ever hope to hear from a slightly jazzy, politely english but musically adventurous bass/drum/organ trio.
The rest is ok, mostly instrumental, side two has some rare moments, but really, it's Newport Hospital that makes this album very very special indeed.