How is the music sound on the S4?

[SMALBA]

I listen to music on my s3 for 5 hours every day and I also have beats tour headphones and klipsch s headphones. The sound is good on my s3 but I was wondering if any of you with the s4 have been using headphones and have noticed anything good or bad about it.

I watched a review and noticed that the s4 has a tune your headphones feature and also would love to know more about that.