The greatness of Mac Rebennack, alias, Dr. John, also known as John Crieux, rests on his command of the musical use of idiomatic expression. Not a technically well-endowed singer, nor a great songwriter, he leaves his mark through the discipline and control he exerts over all that he touches.

On the surface, rock and roll changes at an amazing pace. The influence of a figure like the Maharishi can appear and disappear in a matter of months. Talk about old fashioned rock and roll finds itself dead before it begins.

There is something complete about Stevie Wonder, and one senses that he is not only exceptionally important today, but will continue to be for as long as he chooses.

Bob Dylan may be the Charlie Chaplin of rock n' roll. Both men are regarded as geniuses by their entire audience. Both were proclaimed revolutionaries for their early work and subjected to exhaustive attack when later works were thought to be inferior. Both developed their art without so much as a nodding glance toward their peers.

'Dance to the Music' was just Sly Stone being his natural crazy self right from the beginning. The man was an original and his first AM hit was nothing if it wasn't the example per excellence of the Sly Stone music machine.

The Faces do not, as some have recently alleged, play badly. They are more than competent, especially at creating a mid-Sixties Rolling Stones-styled groove, as their excellent version of 'Memphis' proves.

On first listening, Joni Mitchell's 'Court And Spark,' the first truly great pop album of 1974, sounds surprisingly light; by the third or fourth listening, it reveals its underlying tensions.