The [email protected] Focus series launched a most successful concert of Russian music – that of Shostakovich and Tchaikovsky – Saturday, November 8, graced by the presence of a host of gifted musicians, perhaps first among them pianist Ignat Solzhenitsyn, son of the  internationally distinguished author, Alexander Solzhenitsyn. Under the rubric “Art Under a Tombstone,” the concert, accompanied by a lecture the night preceding, meant to revive the Russian sense of spiritual authenticity after years of political and cultural repression by the Soviet regime.  The program, held at St. Bede’s Episcopal Church, Menlo Park, proffered a wonderfully vibrant Hamburg Steinway for the two featured pianists, Solzhenitsyn and Gloria Chien, to ply their extraordinary gifts. And despite a somewhat dry acoustic in the hall, each of the three works on the program – the Shostakovich Piano Trio in C Minor, Op. 8; the Shostakovich Seven Romances on Poems by Aleksander Blok, Op. 127; and Tchaikovsky’s Piano Trio in A Minor, Op. 50 – achieved a pungent and lyrical illumination that took the modest but thoroughly enthralled audience by storm.