Our guest on ST is Gerhardt Zimmermann, who will be the guest conductor for the next Tulsa Symphony Orchestra concert. (This concert will happen on Saturday night, the 7th, at the Tulsa PAC; more details, including how to get tickets, are posted here.) The evening, which is being presented under the title "Mercurial," will feature three familiar yet stirring masterworks from the Western classical tradition: "Hungarian Rhapsody No. 2" by Liszt, "Appalachian Spring" by Copland, and "Symphony No. 4" by Tchaikovsky.