There are a lot of RealTracks that work well with 12/8. In general, any slow, Swing 8th note style will work. This is because we think of 12/8 as a slow 4/4 with a triplet feel. For example, Moonlight Sonata could be considered (by us anyway) to be in 4/4, with a triplet feel.

Examples of RealTracks like this are _CRYSTAL.STY which sounds like this
http://64.40.109.32/audio/allstyledemos/_CRYSTAL.wma

Also, Blues slow ones like _MDDYSLD.sty
sounds like this... http://64.40.109.32/audio/allstyledemos/_MDDYSLD.wma

Another group of styles that work are Waltz styles played in "Triple Time". That will take a waltz (3/4) at a tempo of 150, and play it like it was a 4/4 style at a tempo of 50, so that each beat has a full bar of waltz. That is esp. useful for soloists.

Have Fun!
Peter Gannon
PG Music Inc.