"This Is Phaze III" lyrics

[includes a quote from Merry-Go-Round (Fischer)]

Spider: This is Phaze III. This is also . . .
John: Well, get through Phaze I & II first.
Spider: Alright, alright. Here's Phaze I . . .
FZ: The audience sits inside of a big piano and they listen to it grow.
Spider: People are going to sit inside of a piano. They're going to listen to this piano grow.
John: They're going to listen to the piano grow?
Spider: Listen!
Monica: This is going to turn into a . . .
Spider: It's going to turn into another Haight-Ashbury. Remember how we commercialized on that scene?
John: That was a relly good move.
Monica: Oh! That was a confession.
Spider: Right, man . . . and all it was was like people sitting in doorways freaking out tourists going "Merry Go Round! Merry Go Round! Do-Do-Do-Do Do-Do-Do- Do-Do-Do!" and they called that "doing their thing."
John: Oh yeah, that's what doing your thing is!
Spider: The thing is to put a motor in yourself

Submitted by Guest

What do you think is the meaning of "This Is Phaze III" by Frank Zappa?