I found this old thread and it made me chuckle. It would have been very appropriate for Scandal music to have played at my wedding had they existed 15 years ago: Rina has the same birthday as my ex-wife, and Haruna's birthday was our anniversary.
If I ever marry again, I chose "Love." I haven't looked up the Yellow translations yet, but it's a beautiful tune and it makes me happy. Perfect for the occasion. In the meantime, I'll be on the lookout for someone who has a birthday in late May like Tomomi and Mami. August didn't fair to well for me the first time around.
Honestly for me, I am still too young to be even thinking about marriage, but if I got married 10 years from now or so, and even if Scandal is not active anymore, I hope I can invite them to my wedding and have them play any song for me, it doesn't really matter what song cause I love them all.
I'd go with Taiyou to kimi for the first dance, then Very special when the guests join us on stage, followed by Anata ga mawaru then STANDARD, Kagerou, Slow it down with LOVE and finish with Chiisana honou