Mastercard Gift Certificates Can I Use A MasterCard Debit/cash Card To Buy Music Online?

Can I use a MasterCard debit/cash card to buy music online? - mastercard gift certificates

I have a voucher Mastercard for Christmas this year and I wonder if I buy his music online. He said speed on the front and back of the card and has a 16-digit number on the front. I've never made a choice to activate the PIN online if the card does not.
Help please!