Ionian is the first mode of the major scale. It’a basically the Greek name for the modern major scale.
The notes in a C Ionian Scale are: C D E F G A B C
The interval structure for Ionian Mode is:
Tone, Tone, Semi-Tone, Tone, Tone, Tone, Semi-Tone
or
Whole, Whole, Half, Whole, Whole, Whole, Half
Tone=2 frets, Major Second
Semi-Tone=1 fret, Minor Second
Whole Step=2 frets, Major Second
Half Step=1 fret, Minor Second
From an ear training perspective, Ionian sounds happy.
Auditory Association (Songs):
- Jump, Dance the Night Away (Intro, Verse, Chorus) – Van Halen
- Summer of 69 (Intro, Chorus) – Bryan Adams
- Always with me, Always with you (main melody) – Joe Satriani