What Is Penumbra Phantasm Leitmotif Exactly Mean?

​‪@p-apyrus1821‬ He helped me to cut down the three leitmotif from "Penumbra-Phantasm-ish.mid" also wrote the sheet. - Penumbra-Phantasm-ish.mid:    • Penumbra-Phantasm-ish - Toby "Radiation" F...   Putnam's video:    • Penumbra Phantasm   Three Toby's Replies About Penumbra Phantasm:    • Three Toby‘s Replies About Penumbra Phantasm   - The first leitmotif: 00:06 The second leitmotif: 00:25 The third leitmotif: 00:32 The sheet: 00:40 1.Descend: 00:52 2.Savior of the Dreaming Dead (Cascade Version): 01:42 3.Oppa Toby Style: 06:00 - 1.Descend ([S] Descend. 3:47 Part) https://homestuck.bandcamp.com/track/...    • [S] Descend. (HD 1080p)   https://homestuck.com/story/1940 2.Savior of the Dreaming Dead (Cascade Version) ([S] Cascade. 6:40 Part) https://homestuck.bandcamp.com/track/... https://homestuck.com/story/4109 3.Oppa Toby Style ([S] Collide. 4:13 Part) https://homestuck.bandcamp.com/track/... https://homestuck.com/story/8087