Canon In Our Hearts

I was thinking today about what music might be appropriate for characters and events not shown in the films. Obviously, we can't have John Williams write us an opera based on the Thrawn trilogy--though it would be awesome--and distinctive leitmotifs would carry over, but I'm curious what music and songs people imagine to fill the void. Any ideas?

(AKA I want an excuse to listen to music I haven't heard before through the lens of my Star Wars obsession.)