James "Jim" Alan Johnston is a music composer who has been working for World Wrestling Entertainment since the 1980s. Johnston is famous for writing many of the memorable entrance theme tunes for WWE including the theme tunes for The Rock and Stone Cold Steve Austin. Johnston has mentioned in past interviews that he suffers from stage fright and a fear of live audiences, and it was this fear that led to him seeking a more 'studio oriented' music career. Wikipedia
The definitive Wikipedia entry for Jim Johnston. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Jim_Johnston_%28composer%29