The overall sound of Until the Whole World Hears have been described as ' pure American rock ' , ' soft adult contemporary ' , and ' CCM ' . Robert Ham of Christianity Today regarded the album as comparable to the sound of rock bands Creed and Nickelback . One critic observed that most of the songs on the album " start off with chords plunked out on a piano or strummed slowly on a guitar , letting the song build slowly toward a massive wave of sound " . The title track have been described as having a " real rock vibe " infused by electric guitar riffs , while " Shadow of Your Wings " have been described as an " unashamed rock @-@ n @-@ roll jam " . " Joyful , Joyful " is driven by a " pulsing " and " driving " string section that " call to mind Coldplay 's ' Viva la Vida ' " . " Mercy " and " Blessed Redeemer " feature female @-@ fronted vocals , the former sung by Megan Garrett and the latter sung by Melodee DeVevo ; on " At Your Feet " , Hector Cervantes and Juan DeVevo joining Mark Hall on vocals .