Majora's Mask features a handful of different instruments. These instruments also function as actual proper instruments you can play, which is cool. Being that we live in 2015 and the internet is very much a thing, it hasn't taken long for people to transcribe multiple different pop songs and play them using the game's instruments. Some of this stuff is bananas.
As a massive Lady Gaga fan, this is probably my favourite. Also -- that melody line is just so clean and recognisable. It sounds great!
This is Yesterday, by The Beatles. This is top notch.
Sandstorm by Darude for those of you into dance music.
Perhaps the moment everyone took it too far: Through the Fire and the Flames by Dragonforce.
I recommend keeping an eye on this Reddit thread. People are doing spectacular things.