The Boston Symphony Orchestra is adding to its website previously recorded performances by the Boston Symphony Orchestra and the Boston Pops, with new content posted every Sunday for eight weeks. The free video series, called “Heroic Performances,” began on April 26 with BSO Music Director Andris Nelsons conducting Ravel’s Daphnis and Chloé and Mozart’s Piano Concerto No. 24 with soloist Yefim Bronfman. Other featured concerts in the series will include Seiji Ozawa, in his final Symphony Hall concert as BSO Music Director (April 20, 2002), leading Mahler’s Symphony No. 9; Erich Leinsdorf (BSO Music Director, 1962-69) conducting Tchaikovsky’s Symphony No. 5 (recorded in Symphony Hall, April 15, 1969); and Andris Nelsons, in his inaugural concert as BSO Music Director, leading operatic excerpts by Wagner, Puccini, Mascagni, with guest vocalists Kristine Opolais and Jonas Kaufmann (recorded in Symphony Hall, September 27, 2014). Each concert is posted for 45 days after the initial Sunday video stream. The series comes under the umbrella of the orchestra’s BSO at Home online offerings during the performance hiatus due to COVID-19.