Brauer uses multiple stereo busses. For "Yellow," he sent:
Chris Martin’s voice sounds massive on the chorus. If you solo the vocal track, you might hear slight double-tracking (recording the same line twice and panning them left and right) or tight harmonies added during the choruses to thicken the sound. Coldplay Yellow Multitrack
The magic of "Yellow" lies in its simplicity and raw emotional delivery. By breaking down the Yellow Multitrack Brauer uses multiple stereo busses