8.10Arpeggio under a melody

Suppose the melody is in your right hand.

You now cannot use the entire right hand for accompaniment.

So move the accompaniment mostly to the left hand.

For C:

LH:

C-G-E-G

while RH plays melody.

For Am:

A-E-C-E

This is one reason arpeggiated left-hand patterns are so useful for solo piano.