There are some Christmas selections and some basically solstice-type celebrations. Well, for a seasonal piece that is not specifically religious you could try Tchaikovsky's Nutcracker Ballet. In fact, any of Tchaikovsky's ballets would suit this season. Like everything they do, it's quite exciting. I caught part of Performance Today 's broadcast of their performance of the Nutcracker from Ann Arbor when I was driving in my car the other day.
Music is one of the great gifts humanity has given to itself.
A great way to introduce people to classical music is by starting with Baroque music, specifically Bach, even more specifically the 6 Brandenburg Concertos. I think it's one of the great recordings of Messiah. In fact, virtually everything John Elliot Gardner has done is terrific, from Monteverdi's Vespers to the Berlioz Symphonie Fantastique. And this has been a great year for Bernstein re-issues since he would have been 80 this year. I'd suggest trying Tower, Amazon, etc.