1. The horns are in stereo, and the stereo is spread out more than normal during some portions of the song.
2. The vocal reverb is pretty long, slightly delayed, and sounds really good.
3. The harmony vocals are incredibly tight, not only pitch-wise, but articulations as well. I would image the singers (Peter Cetera, Robert Lamm and Terry Kath) were more aware than most vocalists of their time about those things thanks to having horns in the band.
4. The sound of Terry Kath's guitar doesn't sound that good by itself as it seems distorted and muddy with little sustain, yet works great in the track (no shock there as it happens often). That said, it has some really nice short ambience on it.
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