When composers write music, one of the most important decisions they need to make is which key to write in. As a general rule (although there are plenty of exceptions!), music written in a major key sounds happy and music written in a minor key sounds sad.
But what happens if you change the key of a well-known piece of music? Every once in a while, arrangers like to find out.
Below are two examples of music with key swaps. The first is a major song written in minor and the second is a minor song now written in major.
There are plenty more examples on Youtube, of popular songs and videogame music alike–even some Beethoven. Why not check a few of them out?