Advice needed -- the original publication (Lection 11-15), page 4 of the file, download here: http://erato.uvt.nl/files/imglnks/usimg ... _11-15.pdf
has the following, centered on the page:
Quite honestly, it looks like an instrumentation, not a title. The index says the same, except that "Fagotto" is italicized and "Solo" is not, which makes it look like "Solo" is the title. I can't find an edition or recording that uses that title. IMC, Amadeus, Musica Rara all publish this as "Sonata", and I can't find anything on WorldCat that uses "Solo" either.
The work page can only have one title. Votes?