Your question is really more about etiquette and style than specifically music. You might consider also asking your question in the General Wedding Advice category.
Ill do my best to answer from the perspective of a music professional. Here are some things to consider:
1. Steel drum music is by nature fun and informal. Is your ceremony program as a whole also breaking away from more serious traditions? If not, the drums may not blend successfully with your ceremony.
2. Ceremony music is more often slow and thoughtful, rather than upbeat and dancable. It may be difficult for a steel drummer to find appropriate music selections.
3. You may want to explore other instruments that still support your Carribean theme. For example, a guitarist performing island-influenced music could work.
In conclusion, steel pan drums could work if you get a good musician and youre comfortable with the goodtime ambience this instrument would lend to your ceremony.
Since Im not a Carribean expert, I recommend that you consult with your wedding coordiantor if you have one or at least someone you trust in the island area.
Hope this helps.
Return To Question