The left hand is the all-important contributor to how your song sounds when you play it on the piano, because it does the following things to help to enrich and support the main melody that you play with your right hand:

- holding down a chord
- playing a series of notes (ie. an arpeggio manner)
- providing the ‘beat’ or tempo of the song in a strumming manner.
- playing ‘filler or countering’ notes that support the main melody
- providing bass when using the lower note

If one arrangement of a song sounds better than another, it often has to do with how the the left hand has been played. If you just hold down the chords and play the melody on the right hand, don’t expect your song to sound that great.

You should also not be just repeating the bass+strum pattern from start to end, as that would be boring. Instead, you would intersperse the pattern with short arpeggios on the chord, occasionally counter and also accenting the bass now and then to add variety.

The video in this blog illustrates the above points.

Thank you.