Which mode has half steps between notes 4-5 and 7-8?

The mode that features half steps between the notes 4-5 and 7-8 is the Lydian mode. In the context of the major scale, the Lydian mode can be derived by starting on the fourth degree of the major scale.

When analyzing the Lydian mode, the intervals are as follows, based on the scale degrees:

• 1st to 2nd degree: whole step

• 2nd to 3rd degree: whole step

• 3rd to 4th degree: whole step

• 4th to 5th degree: half step

• 5th to 6th degree: whole step

• 6th to 7th degree: whole step

• 7th to 8th (octave) degree: half step

In this arrangement, the specific half steps occur between the fourth and fifth degrees, as well as between the seventh and octave degrees. This characteristic contributes to the ethereal and bright quality of the Lydian mode, making it distinct from other modes.

While the other modes have different interval structures and do not conform to this specific half-step arrangement, the Lydian mode's unique setup highlights its position in