Giuseppe Verdi's La Traviata is one of the best-known operas in the repertoire; for those who aren't opera fans, it's the one featured in the movie Pretty Woman. And Germont is one of the better baritone roles. Unlike Puccini, Verdi paid plenty of attention to the lower voices and has some really strong roles for them in many of his operas.
So this is yet another plum for Nick as he reboots his operatic career in line with his newfound vocal strength. And with the relationship between Camilla and Asmedogh now solidified, he can focus his attention on his singing.