Any tuning is possible on a ukulele as long as the construction supports it and a string is available. There are three somewhat common tunings in popular use today, C, D and G tuning - with C tuning the most popular.
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3 Lessons in the “Common Ukulele Tunings” Series
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The lessons are also available individually in the Lessons area of the site. A Lesson series simply organized these lessons into a logical sequence for learning.