 The overall sound of Until the Whole World Hears has 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 <unk> out on a piano or <unk> slowly on a guitar , letting the song build slowly toward a massive wave of sound " . The title track has been described as having a " real rock vibe " infused by electric guitar riffs , while " Shadow of Your Wings " has been described as an " <unk> rock @-@ n @-@ roll jam " . " Joyful , Joyful " is driven by a " <unk> " and " driving " string section that " calls 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 <unk> <unk> ; on " At Your Feet " , Hector <unk> and Juan <unk> joining Mark Hall on vocals . 
