J.S. Bach -
Art of the Fugue and Musical Offering. Sir Neville Mariner and the players of the Academy of St. Martin in the Fields, with soloists Carmel Kaine, Malcom Latchem, Stephen Shingles, Kenneth Heath, John Gray, Neil Black, Tess Miller, Celia Nicklin. From a recording originally made by the ASMF crew in the 1970s but it's an old familiar one to me so I latched onto it when the CDs were issued. Some may prefer another set of older recordings, perhaps the ones with Karl Münchinger and the Stuttgart Chamber Orchestra, and there are many others, some w/ period instruments.
I don't know that very many Bach aficionados short of maybe a classical radio station presenter would elect to listen with focus to these things straight through, but I like them now and then either to hear the counterpoint (skipping around to favorite tracks) or just to have on in the background, when I tire of newer music and wish to be reminded of the art and power of contrapuntal composition.
The six-voice fugue based on 21 notes, in the '
Ricercare' of
The Musical Offering, was Bach's considered riposte to Frederick the Great, then King of Prussia, who had challenged Bach to create such a thing on the fly in his presence, and even provided the theme. But Bach perhaps wisely demurred and instead invented a six-voice ad hoc fugue on a theme of his own choice for that occasion. He did though go home and over time composed what became the varied riches of
The Musical Offering for the king: all of its canons, riddles, fugues and other pieces were based on the king's 21-note theme.