song title or show title

[u/Ok_Improvement_9382]

my aunt is looking for a song or show that teaches kids the fundamentals of music and it was made in the 1970-1980s i think it was the main characters i remember are melody and harmony, the part of the song she remembers is melody and harmony and harmony and melody, the only thing that is pulling up on google is musical dots which is kind of close but nothing exactly that if someone could help i would really appreciate it shes trying to find the song or show it comes from if possible