It's not a bug, it's a feature.

I've discovered a new feature on my iPhone. I call it the "super random song generator."

All you have to do is hold down the home button on the phone until the voice control prompt shows up. Say "Play " and the iPhone will play a random song that sounds nothing like the song you said. 

But wait, there's more say "Play songs by " and you will be rewarded with artists you didn't even know you had. 

I really miss the voice control features on android phones. :(