Show more Corey Mwamba provides a guided listen to the best new improvised music. This week features a rich and dexterous exploration of the acoustic bass from Neil Charles; the saxophonist Matana Roberts and pianist Pat Thomas speak the truth on a new duo recording full of long lyrical lines, locked grooves and neat switchbacks. And there’s music from Zambia's Western Province with plenty of improvisation and individualistic identity on a new compilation called Kangombio Silimba Jazz.