A quanto pare non mi ero sbagliato, nel ritrovare le cover del famoso pezzo di Biancaneve E I Sette Nani, ho trovato la conferma su Wikipedia dell'ispirazione:
The melodic theme for "Heigh-Ho" might have been inspired by Robert Schumann's composition for piano "The Happy Farmer, Returning From Work" from his 1848 work Album for the Young, Opus 68.
The other Dwarf Chorus songs are "Bluddle-Uddle-Um-Dum" (the washing-up song) and "The Silly Song".
Fonte Notizia Wikipedia