The cover song is one of the most interesting features of music. After all, remakes are rarely good in other media (can you imagine someone trying to copy Bill Murray's performance in "Caddyshack"?), but it's possible for a great song to spawn numerous great cover versions. Sometimes, the cover can eclipse the original in popularity, like Michael Andrews and Gary Jules' version of "Mad World."
Coverville is a music podcast hosted by Brian Ibbot that focuses on the cover. Many episodes are "Cover Stories" - a collection of covers by and of a selected artist. The recent "Duran Duran" cover story, for instance, collected both covers done by Duran Duran (a fun version of The Doors' "The Crystal Ship") and covers of Duran Duran songs, like Saybia's take on "Ordinary World":