Take the next tool and create now an element of the corps designed for the Media Player button.

Create Skin for MP3 Player Zune in Photoshop CS

Blending Options-Gradient Overlay

Create Skin for MP3 Player Zune in Photoshop CS

Gradient's
parameters:

Create Skin for MP3 Player Zune in Photoshop CS

Using the previous instrument, represent the button itself.

Create Skin for MP3 Player Zune in Photoshop CS

Blending Options-Inner Glow

Create Skin for MP3 Player Zune in Photoshop CS