Four Thirds for 12-13-12

So, we survived 12-12-12!   To celebrate, we've selected four third symphonies for 12-13-12 on WFCR.  Why four thirds?  Because, silly, four times three is...ahah!  Of course, it also so happens that our annual series of the complete nine symphonies by the guy on the left has reached no. 3 today — but I like my other explanation better.  Anyhow, above are likenesses of the four composers, more or less at the time they wrote their thirds.  Can you name them?