Hi Daniel,
Thanks for the compliment!
They are all "original". The themes for the others were extensions of old "riffs" I used to make up with other musicians "on the fly" while on the job ( jamming, so to speak ). They are as best as I can remember, but not necessarily exact, because they were simply spur of the moment improvs. The base of the pieces are started with the rhythm first, which usually come from bass and drum loops I have saved over time. I find something that fits what I am thinking and then mix in the themes. This time, though, I got brave and started writing some drum parts. I like to surprise myself. Glad you liked it!
Cheers,
Fred