EZReadMusic is the simplest music player, with no extra buttons (in fact, no buttons), which shows the basic information in the biggest font which fits the screen.

I can never read the artist and song title in the car, but this simply plays your current playlist (shuffled), and displays the artist and song title in a large font.

Swipe to skip forwards or back, long press to skip 20s, and tap to start and stop, and that's it. No pictures, buttons, fiddly bits or anything not needed.

It controls the standard music player, so can keep playing when you close the app, and so you can even switch to the standard music player without interrupting the song.

Works in portrait or landscape.