My wedding was quite small and we opted not to have a formal dance. So our "first dance" was more of an impromtu version of a drunken friend serenading us with Chris Deburgh's "Lady in Red" while we danced to it on the patio at the reception. Ours dance was more for a laugh than anything else...
...too bad i can't view youtube clips at work. so unfortunately i can't really advise anything. Hey can anyone tell me the names and the artists of the songs?
I think it's good to go with something classic, but if your tastes are more obscure then just go for which ever one the think is best.
Out of curiosity, which Beatles song did your brother sing Belsius? I'm a huge beatles fan myself.