iTune Icon
Make a 3 color gradient path.
Make another highlight using the same Blending technique as in the previous step and select Screen Blending Mode.
3. CD
Use the Gradient tool and fill the CD shapes with white-grey gradient.
Rainbow Gradient
Make some multi-color line strokes as shown below. Make sure the first and last stroke is white because it will be transparent. Use the Blend Tool (W), click on the edge of each stroke starting from left to right.
Mask
Use the CD shape and mask the rainbow gradient by Ctrl+7 or Object > Clipping Mask > Make. Then select Multiply Blending Mode and adjust the Opacity to 26%.
