Can you get iTunes on a Samsung admire?

No.

The iTunes app is strictly for Apple devices. However you can import your itunes music from your computer onto your Samsung Admire as an external device and play it through your Android music app of choice since Android is fine with .AAC files (itunes music format of choice).

There are other itunes-similar apps for Android on the Market Place that you can check out. I know MetroPCS service offers "Rhapsody" to purchase and download music directly onto the phone.

Hope this helps.