Ask any Undertale fan what they love most about the game and chances are they’ll name the soundtrack. The original music was composed by creator Toby Fox, and received a great deal of praise for its clever use of leitmotifs (recurring themes) to represent each of the main characters. Like 8-bit Wagner, really.
Now it seems Undertale fans will have some more synthy strains to listen to, as the soundtrack for the new Undertale game Deltarune has been released for free on bandcamp.
A whopping 40 tracks are included in the Deltarune album. The music ranges from chirpy piano-funk riffs like “Rude Buster” to ambient (and very creepy) tracks such as “Cliffs”. I feel like Fox really missed a trick here in not calling it Deltatunes.
Source: Eurogamer You can now listen to Undertale creator's Deltarune Chapter 1 soundtrack