Digging up an old thread because I found an interesting piece of text regarding the "city sounds" and voices on the song The Camera Eye. As follows:

The song opens with street sounds taken from the 1978 Superman Movie. The sounds are taken from the scene where Clark Kent arrives at the Daily Planet for his first day of work. The sounds from the movie are edited to some degree but there is no doubth that this is where they came from. The synth intro begins overtop of these background of sounds. The street sounds then change to the sounds of typewriters/teletypers/etc. which is when Clark enters the Daily Planet offices. These sounds fade approximately 50 seconds into the
song.

Incidentally, this text was found at the Rush Tablature Project. I just contributed a transcription change to YYZ there.