Aperitifs on rooftop bars

Hi guys.

I'll be in NYC for the first time from December 28th to January 3rd. I'm very curious to visit the rooftops, and I would like to participate in some aperitif with music or early evening parties in one of them.

I would ask you, therefore:

• Which are the rooftop bars that absolutely cannot be missed?
• Are there any aperitif with music in some rooftops that you recommend in particular?

Thanks a lot