In the following example, the right hand plays a riff created from the Blues scale. A riff is a short repeating pattern which may be altered to fit various chord changes. Riffs are very common in Blues. Try inventing some of your own.
The next song contains first and second endings. The first time you play through the song, play the first ending, (Z), then go back to the beginning. The second time you play through the song, play the second ending (X) instead of the first.