> Coincidentally there are no commonly used scales or modes with two consecutive semitones.
It's common in Bebop to add a passing tone to otherwise heptatonic scales. Consecutive semitones are also a common feature in blues.
It's common in Bebop to add a passing tone to otherwise heptatonic scales. Consecutive semitones are also a common feature in blues.
That may well be their main function, especially in bebop (it's not so certain in blues), but they're still considered as part of the scale.
> For examples in a bebop scale you don’t tend to arpeggiate using both the consecutive tones.
That's true for any non-chord tones. The intervals are still very common (in bebop you commonly simply walk the whole scale up and/or down in straight 8ths or 16ths, playing adding the passing tone for the chord tones to end up on the downbeats).