I use an app called myNoise. It generates some sounds based on presets. The ones I use varies by the theme or genre I'm reading. For example, when I'm reading a medieval fantasy, I select Distant Prayers in Gregorian Voices.

I personally can't. I find it too distracting, even lyricless stuff. Oddly the opposite is often okay... I can listen to an audiobook while doing something else mindless and not miss out on details. But a physical or ebook generally takes my full attention.