Basically to charge something at a price that people wouldn't pay in their right mind. (Excessive charge).
Second person is when something is written with the words "You" and "Your."
For example, "You gazed out the window."
The narrator's tone is arrogant and excited
In the text it says, "She taught me my scales and exercises, too, on the little parlor organ", "I struggled with the 'Harmonious Blacksmith'", and "<span>I had been doggedly beating out some easy passages from an old score of 'Euryanthe'". The boy mostly practiced scales and exercises, but he also played "Harmonius Blacksmith" and "Euryanthe".</span>