don't think there's an answer

there are hundreds (at least) of jazz standards that have long ago effectively left their lyrics in the dust. Many of the old timers on this thread may remember Frank, or Tony or Ella singing one of these tunes.

But at least a couple of generations of players exist that don't know the words to Aint Misbehavin, Desafinado, Autumn Leaves, Softly as in Morning Sunshine, etc or so many others.

The words to many are gone, yet the melodies remain.
For example- Autumn Leaves has to be one of the most played songs in the jazz repertoire.
How often do you hear somebody sing it (in french or english)? One it ten times perhaps? Probably less.

Its just an observation.

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