It is evident by the "Store" button at the top-left corner of the Music app that Apple is really trying to convince its customers to buy from iTunes. But for some of you , it is more of a nuisance than a help , so if you want to get rid of it completely , you should try the "NoStoreButton" , a handy tweak for jailbroken iDevices.
With just a simple installation and respiring , it makes the Store button disappear. This will save you from inadvertently tapping the Store button while your in the Music app. You can grab this nifty tweak from BigBoss repo for free.