I am really enjoying a little book called Elements of Eloquence by Mark Forsyth.
I didn't put it on the what are you reading thread as I wanted to put it forward as a specific songwriting tool, could even be a challenge.
It is basically an English Lesson on many different rhetorical devices, but it is lightly and wittily written, engaging with lots of good clear examples from many sources, Shakespeare to Katy Perry. Each short chapter is titled by the name of the device, some familiar, some not so. As songwriters we naturally use them anyway but I thought many of you would be interested in this generally and also specifically as a writing prompt, UK Amazon has it in summer sale for £1.19 Kindle version
I love wordplay and am glad to have found an enjoyable book all about it... maybe it is just a looong time since I was at school