The Blogging A-to-Z challenge sometimes loses its way when the topic you want to write about doesn't really have anything interesting to say for one of the letters of the alphabet.
So let it be with X.
Further, it's finally spring in Chicago, so maybe the sunlight and warm weather have made me a little lazy.
To that point, let me just say that the xylophone is a percussion instrument with wood bars that you strike with a mallet to make sounds. Like this: