My all time favourite singer.
An interesting and informative doc, especially when he decribed how he 'acquired' his trademark 'growl' by learning to tilt his head sideways and somehow restrict his airflow in his throat.
We saw his at Manchester (Nynex Arena) many years back supporting Van Morrison, he was very good but had some problems with his voice or throat, cuz every 10 mins or so he would let out this huge 'bark like cough', sometimes mid-song.....