That’s a great question, and the answer is most definitely!!
I chose that particular tune “She’ll be coming round the mountain” as it is a good litmus test. If you can play that nicely, then you will be ready for the next step. However, please play any tune that comes to ear, or that takes your fancy! 🙂 In fact I mention this in the the next lesson, Step 4.
Great job on the regular practice by the way, that’s the ticket!