This is a rhythm known as 12/8 TIME or TRIPLET FEEL. TRIPLET FEEL means that the basic rhythm comes in GROUPS of three notes. In 12/8 TIME, there are FOUR of these groups (of 3 beats) per bar. So the Right-hand will be playing 12 ‘beats’per bar. Try it now with a C CHORD.

The LEFT hand plays a 3 note pattern. Like the TWIST rhythm, the 3 notes of the LEFT hand are the same 3 notes in the RIGHT-hand chord

Practise it SLOWLY at first. Look carefully where the left-hand notes come in (x)

Now TRANSPOSE this rhythmic pattern to the chords of F and G (below mid C) and you’ll have the 3 main chords for the old song BLUEBERRY  HILL