Swedish singer performs 'Youth Knows No Pain'
Band's first video in eight years is comprised of YouTube clips
Country star leads Michigan crowd in sing along
Victoria Clemons creates video in memory of her husband
British rockers play a song from their upcoming fifth album
Eighties teen-pop stars sing medley of hits
Choose the Cover contest winners look forward to future
Choose the Cover contest winners take 'Late Night' victory lap
Clip features stars of 'Community' and 'Arrested Development'
Wild performance of 'Gangsta' from new album 'w h o k i l l'
Psychedelic clip for track from 'Circuital'