This squared sans serif has me stumped!
Its from the booklets packaged with Deutsche Grammophon's DVD presentation of Robert Lepage's Wagner Ring at the Metropolitan Opera in 2011-12.
Among the blind alleys I followed were: fonts with a sans+squarish tag at MyFonts
, and a fascinating discussion of The Mystery of Steile Futura http://typophile.com/node/18227
So what am I missing?