Tracks are roughly ordered as shown on the Deltarune Wiki's page on hidden music tracks.
https://deltarune.wiki/w/Hidden_Music_Tracks

Track order is slightly altered to account for continuity (e.g. putting Berdly's weird route encounter track before his battle theme).

Songs included are from either in-game or from the Spamton Sweepstakes. Songs are NOT included if they are not music (e.g. tinnitus.ogg), are identical to audio found on the OST (e.g. digitalroots.ogg from the Sweepstakes), or are just too short to bother (e.g. e.mp3).

If a song's exact credits are not known, they are listed simply as Toby Fox.
