I know we're more Classically oriented, here, but I thought there might be some interest in this.
I've looked around a bit lately for a spiral notebook with music paper on one side and regular lined paper on the other, specifically to use for songwriting. Unable to find anything, I gave up.
Then I said to myself, "Self, in this day and age, can't you just make what you need?"
Sure enough, I made a design and put it up on Lulu.com. I made three different sizes -26 pages, 50 pages and 100 pages. I think they're reasonable priced for what you get.
Please take a look at them, and if anyone has any recommendations to make them better, by all means speak up. I can edit and re-upload the files.
Songwriter's Notebook - Mini
Songwriter's Notebook - Standard
Songwriter's Notebook - Jumbo