"Me And Bobby McGhee" - Original sung by Roger Miller. Cover sung by Janis Joplin.
As much as I liked Roger Miller and his unique talent, I believe that the Janis Joplin version exceeded the original sung by Roger Miller (written by the great kris kristofferson).
An aside - I had an opportunity to see Roger Miller perform in an intimate setting of about 150 people at The Woodlands restaurant in Hickory, NC 20+ years ago and for some unfathomable reason I didn't attend. I am still kicking myself.
http://youtu.be/6ko_bzuODTI