How to remove the Store button in the Music app
Many people say that Apple has give “Store” button at the left of music app in an attempt to push iTunes music purchases on its customers.
Those who do not use iTunes regular basis might not see “Store” as help.
There is a jailbreak tweak called “NoStore Button” for jailbroken devices that can help such people.
All you need to do is to just install it, respiring and the “Store” button would disappear.
NoStore Button is available at Cydia.
Source: iDownload Blog