 Karr-Koussevitzky double bass

The Karr-Kousevitzky bass or Amati bass is a famous double bass previously belonging to Serge Koussevitzky and Gary Karr.Now generally referred to as the "Karr-Koussevitzky" rather than the "Amati"; until recently, the bass had been attributed to the Amati brothers, but now it is generally believed to have its origins in France.