Vocal marathon at the St. Petersburg Philharmonic Six centuries and three eternal themes: life, love and death. Such is the range of “The Human Voice,” a marathon concert held on Sunday. The Goethe Institute and the St. Petersburg Philharmonic are celebrating the shortest night of the year with similar “giant” projects for the third time. In 2007, the focus was on the organ, in 2008 on the piano, and from there it’s one step closer to the voice. In the most literal, physical sense.