the 60x60 untwelve mix contains 60 second audio works with tonal systems that go beyond the traditional tonality in western music and twelve tone music. started in 2010 in collaboration with untwelve, the untwelve mix captures the work of composers in the same format as the classic 60x60 concert, however, the emphasis is on pieces whose pitch content is of interest in that it goes beyond the bounds of the traditional 12-tone equal tempered system. aaron krister johnson is the "macro-composer" or music coordinator of the 60x60 untwelve mix and co-produced the mix with robert voisey at vox novus. was the untwelve mix had a proto-premiere in istanbul, turkey, on april 14, and the official premiere was april 27, 2010, at the museum of contemporary art in chicago. it has since had performances in kansas city, missouri (july 23, 2010), charlestown, massachusetts (june 9, 2010) and is slated to have a performance at slippery rock university, slippery rock, pa, on october 7, 2010, and a chicago repeat performance on october 20, 2010, with video art by patrick liddell. the 60x60 untwelve mix also has had several performances in boston at mobius, "signs of our 60 times 60 ii"