Conductors meeting each other

Here is a collection of pictures featuring conductors meeting other conductors. Some may be surprised, but there were conductors more known as composers (Kodaly, Rachmaninoff, Strauss…) and some conductors started their career as pianists, cellists… 
(they are in alphabetical order, based on the first name from the left…) Special thanks to Misha Horenstein & Mogens Madsen.

Thank you letting me know missing images.
See also 100 compared Mahler 1
Bartok 3rd concerto
Debussy Nocturnes
Berlioz Harold
Sibelius – Symphony n°2

and also alcoholic conductors