Jeremy ‘Jaz’ Coleman, singer and keyboard player with post-punk rockers Killing Joke, is on a tour with a difference at present, as this time he is speaking to the audience rather than singing to them. Unspeakable: A Spoken Word Tour involves the musician, composer, producer, author, lecturer, traveller, philosopher, actor and chevalier des arts et des lettres visiting nine different cities across the UK. Beginning on 19 March in Glasgow, Jaz is criss-crossing the country before the tour finishes up in Cambridge this weekend. Ahead of this foray into the unknown, he promised to “reveal all” ab…