Sometimes when getting into older music, it makes more economic sense to pick up an anthology containing two or more 70+ minutes CDs full of great music. Here are some that have provided me with a lot of listening mileage.
Roy Harper-Counter Culture
Kevin Ayers-Songs For Insane Times

Harper and Ayers are two of the finest 60s-70s era British songwriters I had previously overlooked. In fact, Harper continued to produce great work up until 2000. If you like great sounding acoustic guitars, vocals, and don't mind some caustic socio-political commentary, Harper could be of great interest. He's the guy singing on Pink Floyd's Have A Cigar.
In contrast to Harper, Ayers's easy going, deep mellow vocals are non threatening, and he doesn't take himself or this life too seriously. The anthology cherry picks the strongest material from 1969-1980. Highly recommended!
Gryphon-Crossing The Styles

Gryphon is another British band combining classical and folk elements. They remind me of a cross between Gentle Giant and Steeleye Span. Lots of fine playing and vocals here.
Steeleye Span-Spanning The Years

After getting into Fairport Convention, and The Pentangle, I got hold of this excellent anthology. I subsequently picked up two 3 disc sets containing 10 albums, but I think the anthology would have been enough.
Cream-Gold

What can I say? The first power trio/super group in heavy rock history. I was too young to remember their heyday, so this collection does nicely.
Rahsaan Roland Kirk-Does Your House Have Lions?

A great overview of the blind, eccentric multl-reed player's Atlantic years.
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