Did you ever watch the show Ally McBeal? On the song she said that everyone needed a theme song that played in their heads.
When we write stories authors often have theme songs for books or characters. Certain songs remind you of places or moments of characters.
Some writers use music to motivate them. I did this alot for Mr Right and Other Mongrels but not so much for Hearts Afire. I think maybe because Allegra seemed like the sort of girl (like me) who might have her own theme song and Cassie seemed a bit too sensible for that.
Still there were musical moments. Momemts you could play out like a nice video clip.
For example, if you read Hearts Afire this song might be a good one for Cassie at the start of the book.
I had lunch with my friend Di today. Although I've known here quite a long time, until my books came out this year, she didn't know I wrote. We had a nice chat about how the process works for me and why she can't have the next book NOW. (She's a bit cranky with me because she doesn't want to wait for the 3rd book and also she would like a sequel to Mr Right and Other Mongrels.) Then as I was driving home I heard this song and I thought it would be the perfect theme song for the second part of Allegra and Teddy's story.