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1.
The kind of music that you listen to only when the (convertible) top and all windows are up. Also known as 'closet music' it is the kind of music that you don't want anyone to know that you like.
The Black Eyed Peas came on Hits 1, but the top was down so I couldn't listen. BEP is my favourite top up music!
by carterh September 24, 2006
 
2.
Meaning, buying a card like topping up your cell phone but instead your buying a card with music downloads on it to top up your ipod with new music.
Sam, bought another itunes top up music card at the grocery store for his ipod. Isnt that the 3rd one this month?

by Overseaz September 26, 2006