The quick answer is “Yes, of course you should.” The more complex answer is “But only if you need it.” Your iPhone has an equalizer built in, although it’s not exactly easy to find.
There are quite a few solid music equalizer apps for Android in the market. You will find a lot of them in the Play Store, though most of those music equalizer apps are a part of regular music players ...
Ok, I'm not a huge fan of 'country', but I have a few songs. But iTunes has no equalizer setting for this genre. Shouldn't country have an appropriate config for this genre? I'm no musician but it ...