What are some good songs/albums for a cookout?

We’re having a big cookout for family and friends and I’d like to fill up my iPod with music to play during the event but am having a hard time coming up with ideas.

Most of our guests will be in the late thirties-early forties age range, but also a good number of 60+ and about a gazillion kids. So, nothing overtly sexual or explicit. I’d just like to have some fun, mood-setting background music.

Thanks!