What is in your opinion the most important part of the event mix? Is it the venue?- there are certainly a number of awesome ones around, or maybe the food? (the meal I had last week from Dish at The Natural History Museum was amazing). How about the production?(my friends at Event Concept do remarkable things with lighting and sound)- you can probably see where I am heading here...Despite the brilliance and importance of all those things mentioned above, I am convinced that live entertainment and particularly music is the most important aspect- or actually to be more precise the most memorable aspect- and, what is more, I have science on my side . The bit of the brain that deals with memory is very closely related to the bit of the brain that processes music. Read this fascinating article which covers this in great detail: www.livescience.com/health/090224-music-memory.html.
What this means for all event organisers is that a year after your event people are more likely to remember the music than any other single element of the event. Which leads to my unbiased conclusion that, bluntly, you should spend more time and effort getting that right than anything else!