Regarding this album's vocals, Roger only sings on "Set The Controls...". Wright and Gilmour do the vocals on "Let There Be More Light". That's David who does the chorus not Roger. Roger only sang on 2 songs during this period, "Take Up Thy Stethoscope..." being the other.

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"You hear the night birds calling you,
But you can't catch the words they say,
Close ears and eyes,
Be on your way"

-The Narrow Way