Lykke Li "Youth Knows No Pain" (live on 'Leno') By Josiah Hughes Published Aug 05, 2011 Last night (August 4), Swedish pop vixen Lykke Li brought her Wounded Rhymes to Jay Leno with a live performance of single "Youth Knows No Pain." Check out the clip below. MUSIC STREAMS POP AND ROCK CLICK/HEAR More Lykke Li