Class, led to an increased interest in the art of orchestration, an area into which he would further indulge his studies as Inspector of Navy Bands. The score of his Third Symphony, written just after he had completed his three-year program of self-improvement, reflects his hands-on experience with the orchestra. Professorship brought Rimsky-Korsakov financial security, which encouraged him to settle down and to start a family. In December 1871 he proposed to Nadezhda Purgold, with whom he had developed a close relationship over weekly gatherings of The Five at the Purgold household. They married in July 1872, with Mussorgsky serving as best man. The Rimsky-Korsakovs had seven children. Their first son, Mikhail, became an entomologist while another son, Andrei, became a musicologist, married the composer Yuliya Veysberg and wrote a multi-volume study of his father's life and work. Nadezhda became a musical as well as domestic partner with her husband, much as Clara Schumann had been with her own husband Robert. She was beautiful, capable, strong-willed, and far better trained musically than her husband at the time they married—she had attended the Saint Petersburg Conservatory in the mid-1860s, studying piano with Anton Gerke (one of whose private students was Mussorgsky) and music theory with Nikolai Zaremba, who also taught Tchaikovsky. Nadezhda proved a fine and most demanding critic of her husband's work; her influence over him in musical matters was strong enough for Balakirev and Stasov to wonder whether she was leading him astray from their musical preferences. Musicologist Lyle Neff wrote that while Nadezhda gave up her own compositional career when she married Rimsky-Korsakov, she "had a considerable influence on the creation of [Rimsky-Korsakov's] first three operas. She travelled with her husband, attended rehearsals and arranged compositions by him and others" for piano four hands, which she played with her husband. "Her last years were dedicated to issuing her husband's posthumous literary and musical legacy, maintaining standards for performance of his works ... and preparing material for a museum in his name." In early 1873, the navy created the civilian post of Inspector of Naval Bands, with a rank of Collegiate Assessor, and appointed Rimsky-Korsakov. This kept him on the navy payroll and listed on the roster of the Chancellery of the Navy Department but allowed him to resign his commission. The composer commented, "I parted with delight with both my military status and my officer's uniform", he later