For 10 points, name this German Baroque composer of The Well-Tempered Clavier and six Brandenburg Concerti.
This composer wrote about Lieschen's love of the title drink in his Coffee Cantata. Glenn Gould is known for playing the works of this man, whose Musical Offering cured Count Keyserling's insomnia. This composer of nearly 200 chorales wrote fourteen (*) contrapunctal pieces around a single D-minor theme in his Art of Fugue. For 10 points, name this German Baroque composer of The Well-Tempered Clavier and six Brandenburg Concerti.
This composer wrote about Lieschen's love of the title drink in his Coffee Cantata.
J(ohann) S(ebastian) Bach (prompt on "Bach;" prompt on "Johann Bach")