Smokestack Lightnin’ by the Yardbirds, orig Howlin’ Wolf
Woodstock by Eva Cassidy orig Joni Mitchell
Summertime by Janis Joplin, orig George Gershwin
Ball and Chain by Janis Joplin, orig Big MamaThornton
Not exactly a cover as it's Leonard Cohen performing his own song, but with a mind blowing assist by Sonny Rolllins. Perhaps from David Sanborn TV show maybe 2006.