It's always a better choice to write a new book than it is to keep pounding your head against the submissions wall with a book that's just not happening. The next book you write could be the book, the one that isn't a fight to get representation for at all.
I grew up with rock and pop music from the 70s and 80s. I had to play guitar in school - it was a music college and we had to take instrument classes there - so I think guitar playing and guitar sounds have always been an influence.