Singer John Fogerty hoisted a guitar on the witness stand in federal court and plucked out a twangy tune in an effort to prove he's innocent of plagiarism charges. Fogerty led jurors in San Francisco Monday through his musical roots in 1950s blues songs, playing tapes of Howlin' Wolf and Bo Diddley before picking up an electric guitar for a rendition of Diddley's "Bring It To Jerome."

Fogerty is fighting a plagiarism lawsuit by his former record company that claims he stole one of his own Creedence Clearwater Revival songs for a later solo tune. "Jerome," though in a different style, has a similar tune to the two songs involved in the lawsuit _ "Run Through the Jungle," a 1970 Creedence hit, and "Old Man Down the Road," a song Fogerty wrote in 1984 for his solo "Centerfield" album.