The main reason you never here Achilles Last Stand on the radio (IMO) is because it is 10 minutes long! I remember hearing it a few times on the radio when it first came out, but that was it and I have not heard it there since! Anyway, I have a friend who is a big Zep fan, but is not that crazy about Achilles also. I have had this argument with him as well. Personally, I think that Achilles is the greatest song of all time and Presence the greatest album! But that's just me. Of course, that is the great thing about Zep, they have so many good songs, that there can be a wide range of opinions on which is the best. I would just say, next time you listen to Presence, really crank it up and take a close listen. Presence is best listened to loud! Rock on, phthah