Amazon.com has an audio clip of "Dialogue (Parts 1 And 2)" by Chicago on the album listed below. To listen to this clip, click on the album name and you will be taken to a CD product web page with a list of album tracks linked to song clips.
The Very Best of Chicago: Only the Beginning - Chicago - Rhino Records (2 CDs)The Amazon.com MP3 Store also has a clip of the above song on the album listed below. Click on the album name and you will be taken to a list of mp3 album tracks with audio samples that include the above song.
Chicago V - Chicago