I wrote a novel that's available for any type of E-reader, or on a computer of any kind, and some apps on cell phones. It's called Misspent Youth and you can get it here: http://www.smashwords.com/books/view/... It's only 99 cents, and you can only buy it with a credit card since you're doing it via smashwords! It's such a good book, trust me! You can read the summary of it at the website above also! :) Please check it out!
To listen while using other apps, switch the player to Picture-in-Picture (PiP) during playback — it keeps playing in a small floating window (the screen stays on).
To listen with the screen fully off, in-browser playback stops by YouTube's design. Open the video in the YouTube app to keep listening where background playback is supported (e.g. with YouTube Premium).
Open in YouTube app