Since you are interested in Shostakovich: Symphonies, Vol. 6 - Symphonies Nos 6 & 12, here is a list of other items that you may find interesting.
Shostakovich: Symphonies, Vol. 5 - Symphonies Nos 1 & 3
Royal Liverpool Philharmonic Orchestra & Choir, Vasily Petrenko
[ Naxos / CD - released 1/Mar/2011 ]
"This series… is developing into something really special. These RLPO Shostakovich recordings withstand comparisons with some of the greatest performances on disc." Hugh Canning, The Sunday Times
Shostakovich: Symphonies, Vol 8: Symphony No 7 "Leningrad"
Royal Liverpool Philharmonic Orchestra, Vasily Petrenko
[ Naxos / CD - released 5/Jul/2013 ]
"Is the Leningrad a pastoral symphony? Petrenko would like us to think so. Throughout the performance he looks for pockets of expressive intimacy quite as much as sheer excitement, although he is also capable of eruptive urgency." (Gramophone)