If you're ringing in the new year over a special feast for a few carefully chosen co-conspirators, you want something celebratory but not overwhelming. This batch of tunes, mostly by cool, classy jazz and pop crooners and bandleaders, keeps things on the low-key side of fun, letting you and your guests ring in another trip around the sun in style without blowing your ears out or resorting to "Auld Lang Syne."