Consecutive notes in descending scale heard until now (2,3)

I haven't cracked this one yet — but the brilliant team at Times for the Times have:

Aural word play [heard]:  “soh fah”  (consecutive notes in descending scale). You may recall from the song that the ascending scale is ‘doh re mi fah soh lah ti doh’. There are several different spellings of most of the notes but I have picked two that enable the aural wordplay to apply to both needed for the clue.