Are minor sevenths allowed in baroque counterpoint? I ask because in the first measure of Bach's Invention No. 1 the upper voice and lower voice have an interval of a minor seventh (the upper voice plays C while the lower voice plays D).
They are absolutely allowed and are treated in many different ways. In order to avoid a continuance of asking so many specialized questions, I would urge you to study Johann Fux's Gradus ad Parnassum which is the foundation for counterpoint and studied by all composers.
Also, for future reference, if Bach does it, then it's okay.
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