A 77-year-old picked Katy Perry's "Firework" as their happy song of choice. The suggested songs were as interesting and unique as the people behind them. Organized by generation, these are the ...

A 77-year-old picked Katy Perry's "Firework" as their happy song of choice. The suggested songs were as interesting and unique as the people behind them. Before an annual family road trip ...

Using acoustic analysis technology, powered by The Echo Nest, Spotify has grouped the 4X songs into most and least happy, danceable, artificial, as well as pinpointed some other categories.