Rostropovich's 2nd is available in a three CD set for the price of one
called 'Rostropovich' on DG 449 130-2.  It contains the following cello
concerti:

Dvorak
Schumann
Boccherini #2
Vivaldi RV398 + 413
Tartini
Tchaikovsky - Rokoko variations + Andante cantabile
Glazunov - Chant du menestrel

The only Rostropovich recording of Shostakovich's 1st cello concerto I've
seen is with Ozawa on Erato.

Best wishes,
Ralf Oehlmann
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