I went straight from iOS4 to iOS8 on my iPhone, so the changes are immediately noticeable and extensive. I had to spend a day fiddling around until I figured out how everything works. For a company that prides itself on design, I can say Apple fucked up on the mp3 player. This is the current iOS screen:

In iOS4, the playback bar was above the album art, which for me makes all the difference. I think whoever created this forgets it's not a mouse but rather my ginormous fingers controlling everything. By cramming all the controls at the bottom, it's easier for me to accidentally press something else, especially since this is an mp3 player and half the time I'm not really looking at it. Before there was never an issue because it was separated from everything else, so it was harder for me to fuck up.

You probably can't read the German, but those pink buttons on the bottom weren't there either. From left to right, it's the repeat, create a new playlist, and randomize. Those weren't there before either; they were tiny and diagonal to the playback bar instead of right next to the volume bar, which also means I'm tapping that shit unintentionally.

But this is the most annoying aspect for me right here. On iOS4 if you tapped any random place on the screen, the lyrics would pop up. If there weren't any, then nothing would happen. Here instead the artist's name, title, and CD disappear and the ability to rate the song pops up. Those dots can turn to stars if you tap them accordingly. Considering I'm already fucking up over accuracy, having this shit pop up every three seconds instead of letting me move onto the next track, lower the volume, or progress further into the song makes me want to pull my hair out. Was this something people were complaining about? In the previous iOSes you could still do it, but there was a step or two in between. Were people saying, "Man, what I really want is for it to be easier to rate these songs and tapping to a star menu was too fucking difficult so please smash as many functions into this tiny space as possible." Because that's the only reason why I can imagine they designed it like this.