Bach Fugue in Eb major
Exposition starts on the first note of m1 in the sop on the dominant and ends in m7 on the dominant (Bb) quaver in the tenor voice as outlined in the score.
The exposition begins with the subject in the sop on the dominant of Eb major, ending on first semiquaver (also the dominant) in m2 followed by a semiquaver extension in the sop voice (beats 3 and 4 measure2) finishing on first half of the down beat (the first quaver in sop) in m3.
Alto picks up the subject in m3 on the tonic and ends on the tonic ie the first semiquaver (Eb) in m4. Interestingly while following the exact rhythmic pattern of the original subject, I noted that the first beat of semiquavers starts with a different descending interval compared to the original subject introduced by the sop… as already mentioned the sop starts and ends the sentence on the dominant while the alto starts and ends on the tonic, thus changing the interval between the first and second note in the alto’s answer, making this a tonic answer despite all the other intervals remaining consistent with a 224 51142 semitone pattern as per the interval pattern of the sop. There is one other change from the original occurring at the interval between the quaver rest with the sop stepping down by a semitone, while the alto steps down 3, which also backs up my deduction that the answer in the alto is tonal. This follows the “rule” of form for the exposition where voices alternate their entries between the dominant and the tonic.
Sop counter subjects on the up beat of bar 3 as highlighted in...