I suspect that we are missing a vital ingredient in the subject" Singer Song writer or wronger"
A singer who writes a song
then sings it.(usually in that order)
I think there should be some further discussion regarding the instrumentation if any that may be involved.
Maybe (gasp) I am wrong(nah!never happens)but perhaps you are as I was thinking primarily of the Guitar Playing variety of SS?
Some of the refugees of tin pan alley when they escaped to the recording studios may have played pianee.Or even a musical instrument of some kind.
There may even be some who sing their own songs UNACOMPANIED !
Any thoughts?