This lecture is the Dorian Scale which is one of the Church mode.
Dorian scale is the natural minor scale with a raised 6th.
| C | D | E | F | G | A | B | ||||||
| C Dorian Scale | ♪ | ♪ | ♪ | ♪ | ♪ | ♪ | ♪ | |||||
| C Natural Minor Scale | ♪ | ♪ | ♪ | ♪ | ♪ | ♪ | ♪ | 
Dorian scale has the following triads and 7th chords.
| Triad | Am | Bm | C | D | Em | F#m(b5) | G | 
|---|---|---|---|---|---|---|---|
| Degree Names | Im | IIm | bIII | IV | Vm | VI | bVII | 
| 7th Chord | Am7 | Bm7 | CM7 | D7 | Em7 | F#m7(b5) | GM7 | 
|---|---|---|---|---|---|---|---|
| Degree Names | Im7 | IIm7 | bIIIM7 | IV7 | Vm7 | VIm7(b5) | bVIIM7 | 
Let's listen to the sample song using the Dorian scale.
I cherish the feeling, so the sample song on the pages of scale lectures are made roughly. This song also like a bit boring UK rock sound. I'd be happy if you take dorian scale as a gentle one.