The morse is subtle but if you listen closely you can hear it. Set the Soundcloud player to 1:25 or so and you'll hear singing as they finish up the chorus. As the chorus completes at about 1:31 the singing stops and instruments play. Listen closely, and try to remember what morse sounds like in the movies. It's there in the background, and once you hear it it's obvious. Don't listen to the drums or tambourine, it's not there in the beat. It's "behind" the beat as if a background instrument was playing.

(edit: it also kicks in again around 2:30 and 3:30. So the start times are at approximately 1:30, 2:30, and 3:30.)

Outstanding.