Index, Christopher Larkin, Alan Walker Ed Sheeran
Undertale and Deltarune are Toby Fox's two games, Undertale being the orignal and being massively successful, while Deltarune is still coming out, but is just as good as Undertale. Both games have an amazing story, and an amazing soundtrack and they are all orignally composed by Toby Fox himself. Each area, boss, and certain enemies have their own tune each one made by Fox himself. An example of this would be Megalovnia, the song that plays in the final boss of the "genocide route". It is a great song, and it is so good that the internet has turned it into a meme.
Personally, I enjoy Undertale's song more than Deltarune's but both games have an amazing sound track. Some great songs from Undertale would be Save the World, Bergentrückung, and the meme song itself, Megalovania
As of recentley, Toby Fox has also started to venture outside of his games, creating the great song of the Pokemon Battle Tower Theme in the newest game of Pokemon, Pokemon Sword and Shield.
