Actually, parts of "Cluster One" opened the 1994 shows every night as part of their intro tape.

The sounds of the earth's crust cracking (which are heard at the very start of "Cluster One"), along with many other effects, were incorporated into the ambient soundscape that played for over 45 minutes as the audience was filing into their seats. Part of this was included on the Pulse audio cassette... but it's pretty boring and sometimes downright irritating to listen to, on its own.

You can hear a tiny bit of this during the intro to "Astronomy Domine" on the live CD - some of the spaceship noises from it were crossfaded into Rick's morse-code keyboard riff.

I happen to think that the song itself is a bunch of noodly twaddle, mind you. If they ever did play the whole thing in full, next to "Shine On", it would ridiculously derivative. On that note: how on earth did Gilmour & Co. find the ability to play "Poles Apart" and "Wish You Were Here" in the same two hours of stage performance without their ears burning in embarrassment?

__________________
what do you teach your children about me?
what do you teach your little children about me?
pimp, thug, bling drug lord of the undergrounded kings
how can you be so sure i won't call down the rain?
what do you teach your little children about me?
you point your gun, wait, hide and run. i see it plain