"A Pirate Looks at Forty" is a song written and performed by American singer-songwriter Jimmy Buffett. It was first released on his 1974 album A1A and "Presents to Send You" is the B-side of the single. From Wikipedia
Country music icons Kenny Chesney, Alan Jackson, Zac Brown Band, and Mac McAnally, a member of Buffett's Coral Reefer Band, performed a memorable medley of Buffett's hits "A Pirate Looks at Forty" and "Margaritaville" as a tribute to the late "Margaritaville" singer who passed away at 76 from Merkel cell carcinoma in September.