Kate Rusby, Royal Festival Hall, London, review You do get banter, homely tales about roaming rams, family life and even chit-chat about bladder problems (Dick Gaughan had missed his cue and came on saying his bladder had a mind of its own - prompting Rusby to reply: "tell me about it, I've had two babies."). But underpinning all the humour and relaxed intimacy was the sheer quality of the music during a celebration of Rusby's 20th anniversary as a professional musician. Her new album, 20, has an interesting array of guests, including Paul Weller, Paul Brady and Richard Thompson, who have helped her re-create 20 of the 200 or so songs from her previous albums. Rising American star Sarah Jarosz joined in on Planets while Eddie Reader, Declan O'Rourke and Jim Causley all brought musical gifts to the party. There were 19 performers in total (including a string quartet) in what sometimes resembled a game of musical chairs, with Rusby's husband Damien O'Kane helping things run smoothly. There was also an instrumental interlude when some of the highly talented players - including banjo master Ron Block of Alison Krauss ANC Union Station renown. John Doyle, Jarosz, Julian Sutton and John Joe Kelly helped Block tear into some Irish traditional songs, throwing in a bit of The Muppets theme tune for good measure. Of course, what a packed Southbank audience had come to enjoy was Rusby's crystal clear, fluent voice. She did a fine version of Unquiet Grave ("folk police rules insist that there must be a ghost song," she joked) and I Courted A Sailor was exemplary. Sparkling versions of Awkward Annie and Bitter Boy showed that Rusby is a performer in full control of her powers. "Not bad for a short girl from Barnsley," she said. Too right; this was a chuffin' good concert. And who would begrudge Rusby such an enjoyable night?