According to the Pytheas Center for Contemporary Music, Tardecita pampeana was composed by Piazzolla in 1949. The site piazzolla.org suggests the piece was composed for Argentine pianist, Carlos Garcia. The recording, Folklore en Piano, vol 3 captures Garcia playing it in a 1963/64 broadcast from Radio Municipal de Buenos Aires. That is quite a gap between composition and first recording so I am not sure what the real date of the piece is. It is a rarely heard piece although it is another one of those "rarities" which is readily available as sheet music(BA 1023). Today's video is the only performance of the piece available on YouTube.
The performance is by the Orquesta Juvenil Amadeus under the leadership of Guillermo "Willy" Sotelo in Mar del Plata, Argentina - the birthplace of Piazzolla. I can find no references to commercial arrangements of Tardecita pampeana for chamber orchestra so it is quite possible that this is an arrangement created by Mr. Sotelo. On the other hand, there is a "Piazzolla Museum" in Mar del Plata which has an extensive collection of Piazzolla scores. Perhaps it is an unpublished arrangement from that museum. Regardless, it is a nice arrangement and is competently performed by the student orchestra.
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