Hi David,
it would be great if there was a separate lesson on different types of groove. There's a lot of information about shuffles, rock grooves, rhumbas etc. but it seems it would be useful to have an overview of approaches to these different styles in one place.
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After watching the BluesHarmonica.com overview video, try one of the lessons below to experience a lesson at BluesHarmonica.com.
Answering the question myself: I have found the thing I wanted. It is in the Performance training study 2.