O Magnum Mysterium by Morten Lauridsen. Written for Concert band / wind band with a duration of 4 mins. Purchase, download and print sheet music PDF file now! O magnum mysterium (Duración: 5' 45'') Morten Lauridsen ( -) num num num num mys te te mys mys mys num num num num mag mag mag mag mag O mag um, ad um, um, ri p et ri ri . Explore top gifts · Shop stocking stuffers.