Christmas album

The other day I saw a Target commercial advertising Josh Groban's Christmas album.
When I heard him singing my favorite Christmas carol, Ave Maria, I bought the album the next day!
I am convinced when we make it to heaven, the angels will sound like him and Andrea Bocelli.
The album is good, and I listen to it often!
What I wonder is why so many singers have to come out with a Christmas album, like Toby Keith? Country singing and Christmas carols dont mix...