I happen to live near andre Rieu... http://www.youtube.com/watch?v=LX1fiE0U1qA
Thats the master of the waltz.. Arrangers can't even come close to such a performance

Here the same waltz on Tyros 3 by Robbie does (very good player) to show the difference : http://www.youtube.com/watch?v=LX1fiE0U1qA
And here a german waltz on tyros 3 : http://www.youtube.com/watch?v=hxpmNYhPmxc&feature=fvst
A very different type of waltz.
http://www.youtube.com/watch?v=okQDkp0RY30
This is an Organ orchestrated Waltz on the Roland attelier

A modern and a classical waltz on Korg PA series http://www.youtube.com/watch?v=wIlb_HKc65Q http://www.youtube.com/watch?v=wSPqiazoTx4&feature=related

A french waltzer on the Audya http://www.youtube.com/watch?v=hjvRvIDelhU

So many different types of waltz, but if correctly played on a wedding you will have your dancefloor filled with people enjoying a good waltz.