iTunes Store App not on iPad1

The iTunes Store app DOES NOT exist on my husband's old iPad1 that I am trying to reconfigure for my son. I can't get it in the App Store. In the Music app, pressing the Store button does nothing. My husband says there never was an iTunes Store app on this device. It doesn't matter if that's possible or not, the real question is how can my son get things from the iTunes store? It seems that he would never be able buy music directly from this iPad. My old iPad 1 DOES have an iTunes Store app on it.

Any explanation and solution?

Thanks