There is often more than one way of writing a particular note. E.g.: the note C sharp can also be called D flat. These two notes have exactly the same sound and the same fingering. Therefore, either spelling of the note may occur in the written music. This is called enharmonic spelling of the same note. The G Blues scale is often written using a Db note instead of an C# note. The following example uses both versions of this note.
This 12 Bar Blues solo is derived entirely from the G Blues scale and makes use of the note Db instead of C#.