The cocktail hour may or may not be an extension of your postlude, depending on how and where you have your reception set up in relation to your ceremony. If your guests have had to travel to a new location, you may want to change the style and genre of your music to reflect a more party-like atmosphere. You may want to choose background music that can be played as your guests mingle around the bar and cocktail area. Smooth jazz, instrumental versions of pop songs, string quartets playing classical pieces, or the band playing low-key jazz standards are all good choices for the cocktail hour.