Where to Find Recording Techniques of Major Artists

Huge fan of 3 and 4 part harmonies of the Beatles, Crosby Stills & Nash, Eagles, and Journey…I’m looking on where to find more information on what techniques the producers of these groups used…Any inspiring information out there?

Thanks!

Ray

Some links:
http://bfy.tw/814C
http://bfy.tw/814O
http://bfy.tw/814W