Cum Mortuis in Lingua Morta

Whose song is Cum Mortuis in Lingua Morta?

Artist Album
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Pictures From an Exhibition (Lorin Maazel, Wolfgang Sawallisch)
Mussorgsky
Pictures from an Exhibition
Olli Mustonen
Mussorgsky: Pictures at an Exhibition
Schippers - Columbia Sym, George London, soloists, CHorus (Sony
Mussorgsky - Boris Godunov - Scenes
Various
Piano Concerto No. 2 / Pictures in an Exhibition
Vladimir Ashkenazy
Modeste Mussorgsky