Cantata 140 : “Wachet auf, ruft uns die Stimme” is really one of most amazing pieces ever written. When Ed Cohen declared this in the composition seminar, I assumed he was just waxing poetic about the Baroque era. But just listen to the first movement, when Bach drops out the continuo on “sie rufen uns mit hellem Munde” to let the chorus climb and soar, suspended, before regrounding them with “wo seid ihr klugen Jungfrauen? Wohl auf, der Bräut’gam kommt.” Fantastisch.