While I am not primarily a rock fan: I lean toward jazz, folk, traditional, and world music, I did and do enjoy what we called in the long-ago 1970s Progressive Rock.

Definitions of 'progressive rock'
WordNet- (1 definition)

(noun)
a style of rock music that emerged in the 1970s: associated with attempts to combine rock with jazz and other forms
Synonyms
art rock

Progressive Rock Encyclopedia.

Much Progressive Rock involved "Concept Albums" that worked with a theme or told a story unusual by rock standards. For example, Billy Thorpe's classic cut "Children of the Sun."

Rick Wakeman recorded some of the great concept albums of the 70s: The Six Wives of Henry VIII (1973), Journey to the Centre of the Earth (1974), The Myths & Legends of King Arthur & the Knights of the Round Table (1975).

Merlin the Magician

The Last Battle

One of my favorites, Todd Rundgren Utopia, part 1 and part 2.

And Rush, which may have the only rock song ever made that explicitly enters the Free Will v Determinism debate.

Free Will
RUSH - Lyrics by Neil Peart "Permanent Waves" Copyright 1980 Mercury/Polygram

There are those who think that life has nothing left to chance,
A host of holy horrors to direct our aimless dance.

A planet of playthings,
We dance on the strings
Of powers we cannot perceive
"The stars aren't aligned -
Or the gods are malign"
Blame is better to give than receive.

You can choose a ready guide in some celestial voice.
If you choose not to decide, you still have made a choice.
You can choose from phantom fears and kindness that can kill;
I will choose a path that's clear-
I will choose Free Will.

There are those who think that they were dealt a losing hand,
The cards were stacked against them - they weren't born in Lotus-Land.

All preordained-
A prisoner in chains-
A victim of venomous fate.
Kicked in the face,
You can't pray for a place
In Heaven's unearthly estate.

You can choose a ready guide in some celestial voice.
If you choose not to decide, you still have made a choice.
You can choose from phantom fears and kindness that can kill;
I will choose a path that's clear-
I will choose Free Will.

Each of us-
A cell of awareness-
Imperfect and incomplete.
Genetic blends
With uncertain ends
On a fortune hunt that's far too fleet.

lyrics