Whatever you do,
don't play anything from the soundtrack of 'The King and I', the film is still banned in Thailand as it's considered insulting to Thai people.
I'm assuming the bride is quite young, so she will have been listening to the stuff played in the clubs out there which is heavily influenced by western dance culture ie house, techno etc. as in
THIS mix.
If you are looking for something by Thai pop celebs, try the following links to youtube, I think there's download links on youtube for most of them.
https://www.youtube.com/watch?v=Wx3_78QxFHg
https://www.youtube.com/watch?v=Kfx5WdrS0cY
https://www.youtube.com/watch?v=ahkGRFhyxx4
https://www.youtube.com/watch?v=c51l8vOu0n0
https://www.youtube.com/watch?v=8CNv9mlgqdk
https://www.youtube.com/watch?v=0GBdC2_Q18M
https://www.youtube.com/watch?v=JJnXSG7bucc
Take a look on youtube for 'Thai pop music', 'Thai dance music' and similar search titles BUT be aware of the lyrics, since you don't speak Thai there's possibility of them being inappropriate for a wedding.
Since only the bride and her Thai friends attending the wedding will understand keep your eyes on them for signs of disapproval.
It's a pity you didn't enquire earlier in the week, I could have got you the opinion of people I know who are currently living in BANGKOK, unfortunately its now early evening out there so I doubt I'll get any replies, but I'll give it a try.