Continuing our mini-series exploring Bach’s canonic variations on the Christmas song, ‘Vom Himmel hoch da komm ich her’ BWV 769, we listen to the second canon: a canon at the perfect fifth.

Here is what the initial shape looks like in the right hand:

So the same shape must be imitated down the perfect fifth. It appears like this in the left hand:

I briefly mention the difference between ‘tonal’ and ‘real’ answers. Although the majority of the imitating line appears a perfect fifth below the leader, several accidentals are changed to keep the overall tonality. Hence Bach here gives us a ‘real answer.’ (I.e. where the F# and G# appear in the left hand, find the corresponding notes in the right hand, note the resulting intervals are diminished fifths, not perfect.)

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