John Mellencamp, also known as Johnny Cougar, John Cougar, and John Cougar Mellencamp, turns 70 today. In his 40-plus years as a recording artist, he’s released 23 studio albums, 2 live albums, 4 compilation albums, and 67 singles. "R. O. C. K. In The U. S. A." is from his 1985 album Scarecrow and reached #2 on the Hot 100, #6 on the Mainstream Rock chart, #7 in Canada, and #18 in Australia in 1986.