NPR's Rob Schmitz speaks with pianist Emanuel Ax about his new podcast "Classical Music Happy Hour." ROB SCHMITZ, HOST: Throughout his decades-long career, pianist Emanuel Ax has been performing in the great concert halls of the world. And now, instead of the stage, he is stepping behind a microphone to host a new podcast with WQXR and Carnegie Hall. It's called Classical Music Happy Hour, and it's part interviews, with guests like superstar pianist Yuja Wang and musical comedienne Isabel Hagen, and part game show, with facts about famous composers' deaths. (SOUNDBITE OF PODCAST, "CLASSICAL MUSIC HAPPY HOUR") EMANUEL AX: As Beethoven... YUJA WANG: Could die faster (laughter). AX: As Beethoven lay dying with a failing liver, his publishers thought, you know what he needs (laughter)? You know what'd he really appreciate? A case of wine. WANG: Wow. AX: And as a matter of fact, apparently, Beethoven's last words were, pity, it's come too late. SCHMITZ: That's Emanuel Ax.…