I use reason 3. Some of the almost magic pads it has are simply fabulous for mystical Scottish ballads & airs. I used reason in my latest post in fact called the dark island.
Strings section and the Myroslav choirs. When you can't find that right piano backing in real tracks, reason has some beautiful piano sounds to use. Some excellent organs, violins and wind instruments.
When I use midi, I ALWAYS use the reason library. STILL havn't played with all it has to offer and I've used reason for ages