Even those who sneer at cover bands must admit a great cover can be the gotcha track on any album because, at their best, cover songs are like love letters, not impersonations. Since 2010, the UnderCover collective has consistently struck this rarified note by choosing a guest artistic director to present a classic album front to back, with different artists interpreting every song. Some offerings might have been anticipated, like the Extra Action Marching Band's gleeful construal of Black Sabbath's "War Pigs," but others, like Radiohead's "How to Disappear Completely," performed in a flamenco/Balkan fusion by Elizabeth Setzer and La Tania, have been quite staggering. Tonight's album is Paul Simon's Graceland, the album that simultaneously breached a cultural boycott of apartheid-era South Africa while bringing worldwide attention to those artists who were in exile or struggling under the regime. The enduring legacy of Graceland and Simon's own musical gumbo make this record a natural choice for UnderCover. We kinda hope a metal band performs "Diamonds on the Soles of Her Shoes," but know we won't be let down.