These are eight unused/alternate Deltarune songs that Toby Fox showed at the start of the Undertale anniversary stream.
Unfortunately, they are not avaliable in higher quality at the minute, which is quite a shame - I hope Toby posts high quality downloads of them soon, but I doubt he will. The School Theme especially is wayyy to bassy. These are still really cool and exciting to hear though, and they definitely made the wait for the anniversary worth it (even though the livestream isn't over yet!)
Hope you enjoy :)
0:00 - School (Alternate Version)
1:23 - Checkerboard (Unused Song)
3:13 - Epic Rouxls Battle (Unused Song)
4:48 - Character Joined (Long Version)
4:59 - King Battle (Orchestral Version)
5:42 - The Legend (Alternate Version)
7:26 - Fountain (Unused Version)
8:20 - Main Game Theme (Piano Sketch Version)