Ukulele 

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The ukulele originated in the 19th century as a Hawaiian adaptation of the Portuguese machete a small guitar-like instrument, which was introduced to Hawaii by Portuguese immigrants.  It gained great popularity elsewhere in the United States during the early 20th century, and from there spread internationally.

Video Tutorials

Ukulele Chords Finder

4 Facts About Ukulele

"Hey Soul Sister" by 8 Years Old Boy
Ukulele Duet by Honoka and Azita