Ovation, 7.30pm ★★★★★ Part of the History of Rock ’n’ Roll series, this program traces the electric guitar — the instrument without which, according to many who appear here, the rock revolution could not have unfolded. The legends all have their say. Pete Townshend of The Who insists the electric guitar is a weapon, pure and simple. In his hands, maybe. But then there are pickers like Mark Knopfler, and others. Remarkable doco.