This is a concept album. Some of the biggest selling albums of all time are concept albums. Think of Ziggy Stardust and the Spiders from Mars by David Bowie. War of the Worlds by Jeff Wayne, and my favourite, Brain Salad Surgery by Emerson Lake and Palmer. Vale Keith Emerson.
Songs of the Madman is loosely based on the life of a modern day man, who is like Diogenes. He searches for God, honesty and truth. As he defies the conventions of his time, people call him mad. He is ostracised and left to wonder, who is mad, him or the world, and what have we lost.
There are 12 tracks on Songs of the Madman, and they follow the journey of this man, who like Diogenes, went searching for God, and found a mocking public, to then finding God being claimed dead by the populous, and then, as he felt, the earth abandoned by humans, and then, by God.