Submitted to The Union InConcert Sierra continues its Virtual Third Sunday Series in January with a performance by baritone Mario Diaz-Moresco and pianist Spencer Myer on Sunday, Jan. 17 at 2 p.m. Photo by Fred Hall InConcert Sierra continues its Virtual Third Sunday Series in January with a performance by baritone Mario Diaz-Moresco and pianist Spencer Myer on Sunday, Jan. 17 at 2 p.m. The concert premieres a recording of the duo’s November 2015 InConcert recital that was well-received by the full-house audience. Diaz-Moresco’s resonant baritone voice is complemented by Myer’s masterful work on the piano. The recital program intertwines vocal works of Beethoven, Brahms, and Vaughan-Williams, with solo piano works of Brahms and Ravel.