Hi, if all my songs are in mp3 format, would it be worth it to purchase headphones for a better listening experience? I don't know if the iphone 5 outputs good enough sound to even warrant purchasing these headphones: http://www.amazon.com/Sony-MDRV55-Headphones-MDR-V55-MDRV55R/dp/B007I1QY5Y/ref=sr_1_1?ie=UTF8&qid=1357797180&sr=8-1&keywords=mdr55+extra+bass+headphones




