Hi, I don't know what version of BIB you have and what styles you may have, but the question is kind of hard to answer since there are about 213 styles on rock ballads alone. It would be a matter of buying a BIB package that provides all the styles up until now (cheaper that way)and be ready to spend some time audition the styles that are named as "ballads" or "pop ballads" and experiment with them until you find a suitable one for your song. It sounds boring, but can actually be a lot of fun, and you'll be surprised how many ideas come to you while doing that.

Good luck friend

Mike B

Music should be part of your life
http://www.soundclick.com/blackcatjazzcafeband