Quoting:
I remember seeing this in early 80s or late 70s.

It was like a 1920s tune, with a clarinet, double bass (?) and occassional older male vocals.

Filmclip had lots of junk, antiques perhaps?

I can still hum the tune!
End Quote

If you can hum the tune, can you put it in writing for us? Maybe we'll recognize it. You can use actual notes or use the "Do Re Mi" song from Sound of Music (Do, a deer, a female deer...) and give us the rhythm.

Do Re Mi Fa So La Ti Do   for the notes of the major scale, Do being the key.

Use W for whole note, H for half note, Q for quarter, E for eighth, S for sixteenth, etc.

"Mary Had a Little Lamb" would be:

M  R  D  R,  M  M  M,   R  R  R,  M  S  S,  M  R  D  R,  M  M  M M,  R  R M R, D
Q  Q  Q Q,  Q  Q   H,   Q  Q H,  Q  Q  H,  Q  Q  Q  Q, Q  Q   Q Q,  Q Q Q Q, W

If there are sharps (#) or flats (b) they can be put after the note:
M# for Mi sharp (if you use Do Re Mi)    Bb for B flat (if you use notes).

I hope this helps.