Here is a little breakdown of his technique (for you sjon). You can tell from the guy's playing that he's had some type of classical training.
His LH is basically arpeggiating a chord or part of the chord being played in the RH. The most common way is playing these scale degrees: 1-5-1-3 (but u can arrpegiate more), each number goes up so the second 1 is an octave higher then the first 1
Also, the notes in the LH are to be played while the sustain pedal is down. So, it's more of a roll than an arpeggio. This gives you that flowing sound will the RH is chording or playing a simple melody.
So let's say the chord is a Bb major chord. The RH will obviously play the chord, but the LH will compliment it like this:
Bb, F, Bb, D
So, altogether u have:
Bb, F, Bb, D / F-Bb-D
This is one of the fundamental basic techniques of being a classical pianist. To practice this technique, just take any chord and play it the way I showed above. So, here are ways to practice each type of chord using C for example:
LH/RH
C major: C, G, C, E / G-C-E
C minor: C, G, C, Eb / G-C-Eb
C diminished (dim7): C, Gb, C, Eb / Gb-(A)-C-Eb
C augmented: C, G#, C / G#-C-E
*These can work for any of the altered chords as well. To determine which to use, look at the base chord. Example, a major 7th chord first begins with a major chord base. So, u use the major chord technique in the LH with that chord.
If anyone has any questions on that, just let me know.
