While there's injustice in the world to challenge, there'll be Joan Baez.

Listening to the queen of folk on Monday night, it was incredible to think it's almost half a century since she picked up her guitar and became the heroine of the Sixties protest movement.

The intervening years hadn't diminished her voice, which was as clear and tender as ever.

This was particularly evident in the vocal range of Love Is Just A Four Letter Word and when she later stepped away from the mic - and her voice still carried across the auditorium.

Nor has time dimmed her views, as she commented how Dylan's With God On Our Side seems sadly more relevant today than it did 40 years ago.

But it was far from an evening of preaching or doom and gloom. Joan's razor-sharp wit was on display throughout, from dealing with an enthusiastic heckler to sending herself up, recalling her early repertoire with: "If someone didn't die in one of my songs, it didn't qualify".

Monday's show, the first night of a tour which only includes a handful of UK dates, covered the spectrum of Joan's career. There were old favourites, such as The Night They Drove Old Dixie Down, alongside Christmas In Washington, which features on her new live album, Bowery Songs.

Graham Maby and Erik Della Penna provided gentle accompaniment, before leaving Joan to shine in a solo set.

Towards the end, she referred to ballads she "sang in her day" and joked: "My day just seems to go on forever".

Long may it continue.