An Enthralling Investigation Into The Mysteries Of Music Have you ever wondered how off-key you are while singing in the shower? Or if your Bob Dylan albums really sound better on vinyl? Or why certain songs make you cry? Now, scientist and musician John Powell invites you on an entertaining journey through the world of music. Discover what distinguishes music from plain old noise, how scales help you memorize songs, what the humble recorder teaches...

While Astrid, Snotlout and the rest of the gang are challenging each other to dragon races, Hiccup and Toothless journey through the skies, charting unmapped territories and exploring new worlds. When one of their adventures leads to the discovery of a secret ice cave that is home to hundreds of new wild dragons and the mysterious Dragon Rider, the two friends find themselves at the center of a battle to protect the peace.