John Coltrane is one of my favourite 'voices'.

Have you seen "The World According to John Coltrane? I've watched a couple of documentaries about him lately and this is one of very best. There is a lot of excellent footage of him and other musicians playing--a real treat for those who like jazz from his era, as I do. There are short clips of Charlie Parker, Monk, and Ravi Shankar.

Early on, there is a clip of Coltrane when he was in the Miles Davis band. Miles plays a bit, then Coltrane steps into a solo and the viewer can immediately see what a powerful force he was.