Eagles Over the Kennebec

I have never managed it to one of your book signings (mostly because it was always Too Far From Germany), so I have no feedback/ideas regarding those to share - but I do have a question ... I know and respect your stance on fanfic, and not wanting to do anything against your wishes, wanted to ask how you feel about songs written about characters/events in your universes, IE filk songs? Would you prefer for them not to be written, or do you not mind, or...? (They are kinda like fanfic, but also not, so... I wanted to ask). Thank you for your time, and for writing such wonderful books and characters!