Love Letter aka Wine Box Ceremony

Did anyone do a Love Letter ceremony at their wedding or attended a wedding where the couple did one? We are doing this for our wedding instead of the traditional sand or eternity candle ceremony and I'm looking for a little insight as to how you may have done yours. I envision the officiant giving the "spill" about it and then we walk over to put the letters into the box. I'm wondering if it would be awkward to have soft music playing during the ceremony or not? Also curious, if you did this before the vows or afterwards? Any insight is helpful and appreciated.