Found a piece about this Parker here.

He apparently also wrote an anthem, Jerusalem,

Quote from the piece about him:

Some of Mr. Parker's vocal works have enjoyed exceptionally large sales; as, for instance, "Close to the Threshold," with 140,000 copies, "Jerusalem," 80,000 copies, "At My Window," with a number almost incalculable, etc. Mr. Parker is, moreover, entitled to the distinction of having written the vocal duet which has had, and is still having, the largest sale in the world of any similar composition. This is the charming and perenially popular "In the Dusk of the Twilight." I