I'm trying to add a music file to my project, but I get the error "Could not load EpicScores.wav asset!"

I load the music file like this:

```
Song sound1 = Content.Load<Song>(@"EpicScoreCreatorOfWorlds.wav"); 

```

I've tried both with and without the `.wav` ending.

My file is added to the *Content* folder, and I've made sure my file properties are set to the "Content" build action and to "copy always."

Why do I get this error and how can I fix it?