New in version 2.0.
True when mdi is unlikely melodic diatonic interval in JSB chorale.
abjad> from abjad.tools import tonalitytools
abjad> mdi = pitchtools.MelodicDiatonicInterval('major', 7)
abjad> tonalitytools.is_unlikely_melodic_diatonic_interval_in_chorale(mdi)
True
Otherwise False.
abjad> mdi = pitchtools.MelodicDiatonicInterval('major', 2)
abjad> tonalitytools.is_unlikely_melodic_diatonic_interval_in_chorale(mdi)
False
Return boolean.