Play piano to her personally. Not over the phone, for her sake. And I meant to type like a man always, meaning on MSN as well.
Ask her out for dinner as a birthday present (doesn't have to be on the actual birth*day*). A kiss on a date is much more appropriate for a gift. You can ask her to close her eyes and stretch her hands, put your left hand over her eyes, your right hand you hand her any small gift, and then you can give her the "gift". If you try this, make sure you switch the purpose of your hands to hold the side of her head with the left hand (instead of keeping them over her eyes), and hold her hands with your right one (instead of holding the gift) as you kiss her.