Those who are familiar with bassist Charlie Haden (playing the Barbican on May 21-22) and his landmark with Ornette Coleman recordings in the 1950s or with Keith Jarrett in the 1970s could find its aged over 25 years Quartet too graceful West by comparison - even more now that it has been increased with low lighting six singers and a swoony whole strings. But the patient Haden lyricism and devotion to the melody of the classic song always have a disguised form of intensity and a perfect touch. Cassandra Wilson, Diana Krall, Melody Gardot, Norah Jones, Renee Fleming and wife of singer bassist, Ruth Cameron, join the group for this attractive intimate sway with standard songs famous and less known, but the instrumental Quartet coldly Groove also has half the time for himself, for a series typically successfully of improvisations featuring saxophonist Ernie Watts, pianist Alan Broadbent. Gloss low on My Love and me, with his Wilson sax Watts and bass of the wrap-around Haden, is a very important point, as opera burn slow subtly underestimated of the singer Fleming on Love Like This. But all performances are affected by the instinct of the Haden to do the right thing quietly. It has not been on the front for the weeks in the charts French album jazz for nothing.