Joe, for the 70's -90's music I have and suggest the following, however these VSTis can be used in any era and genre:

Kontakt - for the basics
There are a lot of patches you can buy for Kontakt, including Vintage organs , Vintage horns for funk and a ton of others

http://www.native-instruments.com/en/products/komplete/samplers/kontakt-5/

Korg M1 and Korg Wavestation - obviously for the Korg stuff
These contain all of the cards for both instruments

http://www.korg.com/us/products/software/korg_legacy_collection/

Fm8 - for the Yamaha stuff.
FM8 will read most all of the Yamaha synth patches, i.e DX7, TX 81z etc

http://www.native-instruments.com/en/products/komplete/synths/fm8/

Samplemodeling - for brass and woodwinds - best if used with wind controller or keyboard with either breath controller or expression pedal

http://www.samplemodeling.com/en/products.php


I'm no longer allowed to go caroling at the psych hospital.
I guess Do You Hear What I Hear was a bad song choice!

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware