Only those series for which albums have appeared are mentioned here.

A period of ill health meant his next album did not appear until 1998.

The album has appeared on several end of year lists.

In 1971, when the first album appeared, this was even more true than it is 35 years later.

The live album finally appeared as an official American release in 1976.

Their next new album, Discovery, did not appear until 1979.

The first album is named like the name of the group, and appears in 1989.

A double live album from this tour appeared in the following year.

However the album did not appear on any sales charts.

The album does not appear to be available on their site any longer.