by steltz » Mon Jul 16, 2012 10:30 am
Duos is what Grove lists the title as, so I had put a comment on the workpage regarding this title. I would ordinarily just assume that Grove uses what is on the autograph manuscript, hence "Duos", but in the op.16 case, all three editions on IMSLP use the term Sonata. On the other hand the Bärenreiter edition doesn't say "Urtext" in this case.
Do you happen to know where the autograph manuscript might be? If I could look at a library entry for an autograph manuscript, that would solve the issue -- our policy is mostly to use what the composer originally used (with a couple of standardizations). Thanks.
bsteltz