John "juke" Logan

John Logan (born September 11, 1946, Los Angeles, California, USA – died August 30, 2013, Joshua Tree, California, USA) was an American electric blues harmonica player, musician, singer, pianist and songwriter.
He is perhaps best known for his harmonica playing on the theme music for television programs Home Improvement and Roseanne, and films Crossroads and La Bamba. In addition to playing on many other musicians' work, Logan released four solo albums, and wrote songs for John Mayall and Gary Primich. He gained his nickname "Juke", following his constant playing of Little Walter's track, "J".