I was just sitting here thinking about the tunes for the next party and I wanted to make a suggestion.
If you are planning a cool party and you want some great background music. I suggest that you try Ultra-Lounge: On the Rocks, Pt. 1 and Pt. 2.
The selection features many greats doing covers of great songs such as Mel Torme's cover of Happy Together.
These tunes will go well with chilled martinis as the cool sounds fill the room making you think sitting a lounge talking with friends.