I apologize for my rudeness in connection with solfa. I shouldn't have used language that appeared to suggest that solfa was a well-established system of musical notation that everyone ought to know & use. What I meant was: Solfa, suitably abbreviated, lends itself to a way of jotting down tunes that is easy to read thereafter. If I use it on the Web, I always briefly explain it on the spot: something like "(Scale is drmfsltDRMFSLT.)". As exemplified there, I eke it out with capital letters if the tune contains notes higher or lower than the octave. If it spills over in both directions (not very common), I have to define somethings special. Likewise if there are accidentals.

If I want to indicate the rhythm, I used dots to indicate extension of a note by a suitably short time. Thus, "Yankee Doodle" comes out ddrmdmr. ddrmd.TS ddrmfmrd TSLTd.d. etc.

I *am* rather surprised to learn that the names of the notes (which I gather originated in the syllables of a medieval hymn) are no longer widely known. In my youth they were even alluded to in show tunes.