Can anyone help me?  I am trying to figure what the original work was in
a couple of pieces that Fritz Kreisler used to perform as bon-bons.

Two of them were designated Andante Cantabile, one was from Mozart, and
the other was from, I believe, Tchaikovsky.  My understanding was that
the Tchaikovsky was from a string quartet in C.  Is this correct?  What
is the opus number, does anyone know?

The other work is also from Mozart, and is called the Minuet in D.  Of
course Mozart wrote hundreds of minuets, and a good number of them were
in D.  I understand that looking for this movement is like looking for a
needle in a haystack; but knowing that Kreisler played it as a solo (with
piano accompaniment) probably narrows it down.

My memory of the tune is completely gone; all I can remember is that I
loved it!  I can't even recall the opening phrase.  And the 78 on which
I heard it has been lost.  <grind teeth>.

Thanks in advance.  I'm trying to collect the original works from which
I was fed very nutritious non-bleeding chunks as a kid, and in every
case I am enjoying the whole work almost as much as I enjoyed the
chunk.

Archimedes.