You’re Ridiculously Talented!!
What they are asking is for you to do a couple/few pieces that would be available to them; with your opinion on how best to use your music. They are just trying to see what your vision is, and how you feel your “talent/creations” would be best served.
Your theme is “Optimistic, Hopeful/Hopeless Romantic, Dreamy, and Slightly Melancholy”.
Have you thought about doing simple String Beds, Pads, and Ambient sounds as an under-bed, with your guitars as the major focal-point?
If I owned a Library, You would be signed!!