The Prelude and Fugue in C, BWV 553, is often performed at weddings — both the prelude and the fugue are fairly short, and fairly easy.
I arranged the set for brass quintet mostly because of its audience familiarity. It works well in this setting, though, and either of the two, or both together, can be an effective concert opener.
There is no live performance recording, so the mp3 audio is a FINALE MIDI audio extract (not the greatest sound, but you can get the idea of how the pieces go).
This piece is not published, and is available from me - it sells for $15.00 for the hard copy and $10.00 for the pdfs.