Dark Side of the Moon is among the greatest albums ever produced, however the song "Echoes" from the "Meddle" album ranks as my favorite song - in it I can imagine the birth of life on earth, evolution, and the eventual destruction of the planet due to human stupidity...although I sometimes hear in it instead a universal spirit that transcends everything. I guess that's what I like so much about the song.
Of course, still other times I just think that the lead riff rocks at the climax of the song, and that's enough.
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