Even the most die-hard anti-Christian is likely to concede that a lot of the music inspired by Christianity is excellent, although the words are often simply appalling. Growing up in the Methodist Church with its emphasis on singing, I used to love the hymns we sang in church and the Christmas carols.
As Steve Martin points out, atheists have no such songbooks. Here he and the Steep Canyon Rangers offer up one potential contribution.
Actually having our Sundays free in exchange for singing hymns in church looks like a pretty good deal for atheists.