Chittlins: I didn't know the observation deck never opened. I could swear I had friends who went up in there. About the acoustics, you are right! I remember the city going to all sorts of trouble to "improve" the sound inside there. I did see some of the "Memphis Wonders" series of cultural events and exhibits in there including Russian/German artifacts from WWII, Titanic display, and an Egyptian exhibit. All three were fabulous.
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Memphis finally did get it's Hard Rock Cafe. It is located on Beale Street.
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Flooding on the Mississippi in the last few years has created all kinds of headaches in maitaining the Pyramid. One corner of the foundation is is rough shape.
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Trivia: When the Pyramid was built, several businesses were named in recognition. One of the most visible was the "Pyramid Deli" located in the downtown area. I remember passing it several times. It is shown in the movie "The Firm" starring Tom Cruise. A scene was shot inside the deli, and it is mentioned by name in another scene.