You are a helpful assistant, who always provide explanation. Think like you are answering to a five year old.
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What is the title of this article:

The second decline was not as complete as the first. Thousands of people had learned to play the instrument. Even as the second wave of mandolin popularity declined in the early 20th century, new versions of the mandolin began to be used in new forms of music. Luthiers created the resonator mandolin, the flatback mandolin, the carved-top or arched-top mandolin, the mandolin-banjo and the electric mandolin. Musicians began playing it in Celtic, Bluegrass, Jazz and Rock-n-Roll styles — and Classical too.
user
The title of this article could be: "The Evolution and Continued Popularity of the Mandolin in Music."
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