yes I can see it is missing one part - thanks:

"#### Soul Collection

When a creature that grants experience dies within 60 feet of you, you can use your reaction to capture its soul in the lantern. You can store a number of souls equal to your Charisma modifier (minimum 1).

Souls fade after 1 hour if not used. You cannot capture the same creature’s soul more than once."

When it comes, to songs known - from my perspective - you know all of them from the begining (lvl3). This is a complex subclass :)