: The set of black and white keys. You press these with your dominant hand to play notes.

Before we dive into the lessons, let's first understand what a harmonium is. A harmonium is a free reed aerophone, similar to an accordion or a harmonica. It's a popular instrument in Indian classical music, often used in devotional songs, folk music, and classical compositions. The harmonium typically consists of a keyboard, a bellows, and a set of reeds.