Feel the itches and hear the songs. Label it mentally “body itching” or “memory of songs”; or simply, “sensation”, “memory”. Then guide your attention back to your meditation object.
One of the beautiful gifts of meditation is training not to react. Showing us that what we perceive is one thing, what we think/feel is one thing, and what we choose to do with it is another.
When it happens, see that you have a choice. And exercise your power. Your awareness will get more acute, and your self-control will be more powerful.
Your body and mind are trying to distract you from the practice. Hold firm. You are the master of the house here