Photographs of musicians watching other musicians playing are always of interest, at least for me, as they can show concentration, excitation, wonderment, adoration, inattention and even scorn. This photograph of Louis Armstrong watching Argentinian tango singer Edmundo Rivero, probably from Satchmo's South American 1957 tour, is now up for auction on ebay.
I am not sure how to describe Armstrong's not very expressive face. Poetical (and not so poetical) adjectives are welcome!
