In case you're curious, I did an e-mail interview last year with the composer of the "Announce Chime" Richard Bellis. I don't want to just promote my site, so send me a PM if you'd like to read the full thing. Here's his response to my question on Star Tours and the chime:
"That was not intended to be any kind of “iconic” signature. It was merely a part of the audio environment of the preshow. I, of course, was influenced by the Close Encounters motif but just looked for five notes that were in major and sounded idiomatic. It was interesting when the news broke that Michael Giacchino was going to do the current version, fans of the attraction blogged their concern about whether or not the “Announce Chime” would be lost.
Michael, who I think is terrific, replied that he would never want to replace that chime as it had become so iconic. Who knew? The other piece of music written for a “scene” in the preshow which was never created is The Droid’s Room. The setting was supposed to be a workshop where many droids are repairing and working on various parts of the spacecraft. The final use was in a “boombox” next to one droid doing repairs. But the cue made it on to a number of the park CDs."