2/4. Paul Sexton profiles Arkansas-born singer/songwriter and pastor Al Green, whose music bridges the gap between gospel and soul like perhaps no other popular performer. This instalment features input from producer Willie Mitchell - who helped to create Green's distinctive 70s sound - musician Howard Grimes and Robin Gibb of the Bee Gees, whose US number one How Can You Mend a Broken Heart was famously reinterpreted by Green.