Amyotrophic lateral sclerosis (ALS), sometimes called Lou Gehrig's disease, is a rapidly progressive, invariably fatal neurological disease that attacks the nerve cells (neurons) responsible for controlling voluntary muscles.
The Alpine Scheitholt furnishes an example of this older type of European zither. By the late 18th century, two principal varieties of European concert zither had developed, known as the Salzburg zither (with a rounded side away from the player), and the Mittenwald zither (with both sides rounded).
Types of harmonicas. Though there are a number of specialty harmonicas, the three most common varieties fall into one of three categories based on how they are tuned: diatonic, chromatic, and tremolo. Weâll focus mainly on these while touching on a few of the less common harmonica types.