Each piece of music, be it a song, symphony or concerto, is written in a specific ‘key’. But what do we mean when we refer to a musical key, why are there 24 of them, and how do composers choose which ...

o find a song that matches our mood, in the 21st century, we need only type in how we are feeling or walk into a new room, and a streaming service’s algorithm will grab that data and intuit our needs ...