FIRST, my deepest sympathies for your loss. And Huntsville is a great town, but I prefer Athens just West of you (I lived and worked and played in Alabama for 24 years, B’ham and Anniston areas).
If I were in your position, needing a sound system hooked up, I’d call the AV department at U of A Huntsville and ask for help. OR ... make a drawing of everything, every socket, every color, every lettering on the panel where the wires would be plugged in, then take THAT to the nearest Radio Shack and ask them based upon the wires and plugs and colors of panel and speakers what should go where.
Ah... I'll bet YOU can do it, with just a little help!
Your computer sound plays thru your computer speakers, and there is a jack on your computer where this audio comes out:
The OUTPUT one will say LINEOUT, or SPEAKER, or HEADPHONE, or GREEN colored
(A notebook computer there may be only one or two jacks, usually located on the side or rear of the computer. The sound output jack is usually identified by a drawing of headphones or a speaker. )
Using a standard computer audio connection cable, (You can get this most anywhere - Wal-Mart will have them in the video/music/tv/computer area.)
insert the mini-plug into the audio output jack. (or the GREEN one if you have a desk computer)
Your husband's music system should have audio inputs similar to what is seen here.
insert the red/white jacks into the same colors on his stereo, and you now have success!
Note what LABEL is associated with those jacks so you select the correct INPUT when trying to hear your station.
Good luck!