The short answer is it feels effing awesome to have that kind of instinctive ability to hear something, and play it back, instantly and accurately. However, it

The short answer is it feels effing awesome to have that kind of instinctive ability to hear something, and play it back, instantly and accurately. However, it's a bit more nuanced than that. Playing the notes accurately is only one aspect of playing music. Playing the notes accurately and expressively is really what you're aiming for. There are a couple of distinct skills you can build to do this: 1. Training your ear to recognize chords and melody notes. This requires a lot of active listening to music, and learning music theory, so you can recognize what's being played. 2. Building the motor skills on your instrument so you can play many kinds chords and notes, instinctively. This requires hundreds (or thousands) of hours of practice. Then the trick is putting the two together: listening to music, recognizing the chords and notes being played, and then playing them back yourself on your instrument. Now the harmonium is a relatively simple and limited instrument consisting of a bellows and a small keyboard (usually 2.5-3.5 octaves). Most of the "chords" on this instrument are actually played with the bellows blowing air over banks of reeds. So you don't really need to build a lot of muscle memory to play chords (as you would on a piano). And melodies on the harmonium are typically played slowly. So learning to play the harmonium won't take as much practice as say a piano or a guitar would. You could get quite good at the harmonium with say 500 hours of practice, which is not actually that long. In terms of practical steps, I'd probably watch a lot of harmonium videos on YouTube and try to get your harmonium to sound like what they're playing in the video. One major difficulty you're going to have is that different harmoniums can sound quite different, depending on how many reed banks a harmonium has, how many octaves its keyboard has, whether various stops are pulled out, etc. So I don't think it'll be easy to truly sound just like what you're hearing because the variation between your harmonium and the other harmoniums out there is quite big. Hope this is helpful! Me: I'm a classically trained pianist and I've owned and played harmoniums in the past.